diff --git a/src/main/java/ru/tn/courses/ofefelov/v1/task1/subtask1/Subtask_1.java b/src/main/java/ru/tn/courses/ofefelov/v1/task1/subtask1/Subtask_1.java
new file mode 100644
index 00000000..11cf16f1
--- /dev/null
+++ b/src/main/java/ru/tn/courses/ofefelov/v1/task1/subtask1/Subtask_1.java
@@ -0,0 +1,15 @@
+package ru.tn.courses.ofefelov.v1.task1.subtask1;
+
+public class Subtask_1 {
+    public static void main(String[] args) {
+        int[] massive = {1, 2, 3, 4, 5};
+        int k = 2;
+        int summ = 0;
+        for (int counter = 0; counter < massive.length; counter++) {
+            if (massive[counter] % k == 0) {
+                summ += massive[counter];
+            }
+        }
+        System.out.println(summ);
+    }
+}
diff --git a/src/main/java/ru/tn/courses/ofefelov/v1/task1/subtask1/Subtask_2.java b/src/main/java/ru/tn/courses/ofefelov/v1/task1/subtask1/Subtask_2.java
new file mode 100644
index 00000000..773401ee
--- /dev/null
+++ b/src/main/java/ru/tn/courses/ofefelov/v1/task1/subtask1/Subtask_2.java
@@ -0,0 +1,31 @@
+package ru.tn.courses.ofefelov.v1.task1.subtask1;
+
+import java.util.Scanner;
+
+public class Subtask_2 {
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+
+        System.out.println("Введите длину очереди n:");
+
+        int n = scanner.nextInt();
+        double[] t = new double[n];
+        double[] c = new double[n];
+
+        System.out.println("Введите время обслуживания i покупателя:");
+
+        for (int i = 0; i < n; i++) {
+            t[i] = scanner.nextDouble();
+            if (i == 0) {
+                c[i] = 0;
+            } else {
+                c[i] = c[i - 1] + t[i - 1];
+            }
+        }
+
+        System.out.println("Введите пребывания i покупателя в очереди:");
+        for (int i = 0; i < n; i++) {
+            System.out.println(i + 1 + " покупатель : " + c[i] + " единиц времени в очереди");
+        }
+    }
+}
diff --git a/src/main/java/ru/tn/courses/ofefelov/v1/task1/subtask1/Subtask_3.java b/src/main/java/ru/tn/courses/ofefelov/v1/task1/subtask1/Subtask_3.java
new file mode 100644
index 00000000..90b0a5f6
--- /dev/null
+++ b/src/main/java/ru/tn/courses/ofefelov/v1/task1/subtask1/Subtask_3.java
@@ -0,0 +1,34 @@
+package ru.tn.courses.ofefelov.v1.task1.subtask1;
+
+import java.util.Scanner;
+
+public class Subtask_3 {
+    public static void main(String[] args) {
+        int[] a, b, c;
+        Scanner scanner = new Scanner(System.in);
+
+        System.out.println("Введите длину последовательностей n:");
+
+        int n = scanner.nextInt();
+        a = new int[n];
+        b = new int[n];
+
+        System.out.println("Введите последовательность a:");
+        for (int i = 0; i < n; i++) {
+            a[i] = scanner.nextInt();
+        }
+
+        System.out.println("Введите последовательность b:");
+        for (int i = 0; i < n; i++) {
+            b[i] = scanner.nextInt();
+        }
+
+        System.out.println("Новая последовательность без нового массива:");
+        for (int i = 0, j = 0; i < n && j < n; j++) {
+            while (i < n && a[i] <= b[j]) {
+                System.out.println(a[i++]);
+            }
+            System.out.println(b[j]);
+        }
+    }
+}
diff --git a/src/main/java/ru/tn/courses/ofefelov/v1/task1/subtask2/Computer.java b/src/main/java/ru/tn/courses/ofefelov/v1/task1/subtask2/Computer.java
new file mode 100644
index 00000000..1cbbe1b6
--- /dev/null
+++ b/src/main/java/ru/tn/courses/ofefelov/v1/task1/subtask2/Computer.java
@@ -0,0 +1,72 @@
+package ru.tn.courses.ofefelov.v1.task1.subtask2;
+
+public class Computer {
+    private String name;
+
+    private String CPU;
+
+    private String RAM;
+
+    private String harddrive;
+
+    private double price;
+
+    private Type type;
+
+    public Computer(String name, String CPU, String RAM, String harddrive, double price, Type type) {
+        this.name = name;
+        this.CPU = CPU;
+        this.RAM = RAM;
+        this.harddrive = harddrive;
+        this.price = price;
+        this.type = type;
+    }
+
+    public Type getType() {
+        return type;
+    }
+
+    public void setType(Type type) {
+        this.type = type;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getCPU() {
+        return CPU;
+    }
+
+    public void setCPU(String CPU) {
+        this.CPU = CPU;
+    }
+
+    public String getRAM() {
+        return RAM;
+    }
+
+    public void setRAM(String RAM) {
+        this.RAM = RAM;
+    }
+
+    public String getHarddrive() {
+        return harddrive;
+    }
+
+    public void setHarddrive(String harddrive) {
+        this.harddrive = harddrive;
+    }
+
+    public double getPrice() {
+        return price;
+    }
+
+    public void setPrice(double price) {
+        this.price = price;
+    }
+}
diff --git a/src/main/java/ru/tn/courses/ofefelov/v1/task1/subtask2/OnlineShop.java b/src/main/java/ru/tn/courses/ofefelov/v1/task1/subtask2/OnlineShop.java
new file mode 100644
index 00000000..7e4e1a9c
--- /dev/null
+++ b/src/main/java/ru/tn/courses/ofefelov/v1/task1/subtask2/OnlineShop.java
@@ -0,0 +1,13 @@
+package ru.tn.courses.ofefelov.v1.task1.subtask2;
+
+public class OnlineShop implements PriceCalculator{
+    private int percent = 20;
+    public String sellComputer(Computer comToSell){
+        return "Computer " + comToSell.getType() + " is selling for " + calculatePrice(percent, comToSell);
+    }
+    @Override
+    public double calculatePrice(int percent, Computer comp) {
+        double priceToSell = comp.getPrice() + comp.getPrice() / 100 * percent;
+        return priceToSell;
+    }
+}
diff --git a/src/main/java/ru/tn/courses/ofefelov/v1/task1/subtask2/PriceCalculator.java b/src/main/java/ru/tn/courses/ofefelov/v1/task1/subtask2/PriceCalculator.java
new file mode 100644
index 00000000..4c278376
--- /dev/null
+++ b/src/main/java/ru/tn/courses/ofefelov/v1/task1/subtask2/PriceCalculator.java
@@ -0,0 +1,5 @@
+package ru.tn.courses.ofefelov.v1.task1.subtask2;
+
+public interface PriceCalculator {
+    public double calculatePrice(int percent, Computer comp);
+}
diff --git a/src/main/java/ru/tn/courses/ofefelov/v1/task1/subtask2/Subtask_1.java b/src/main/java/ru/tn/courses/ofefelov/v1/task1/subtask2/Subtask_1.java
new file mode 100644
index 00000000..f10485a9
--- /dev/null
+++ b/src/main/java/ru/tn/courses/ofefelov/v1/task1/subtask2/Subtask_1.java
@@ -0,0 +1,9 @@
+package ru.tn.courses.ofefelov.v1.task1.subtask2;
+
+public class Subtask_1 {
+    public static void main(String[] args) {
+        Computer computer = new Computer("Comp1", "intel", "1000", "kingston", 2000, Type.DESKTOP);
+        OnlineShop onlineShop = new OnlineShop();
+        System.out.println(onlineShop.sellComputer(computer));
+    }
+}
diff --git a/src/main/java/ru/tn/courses/ofefelov/v1/task1/subtask2/Type.java b/src/main/java/ru/tn/courses/ofefelov/v1/task1/subtask2/Type.java
new file mode 100644
index 00000000..7e5ed188
--- /dev/null
+++ b/src/main/java/ru/tn/courses/ofefelov/v1/task1/subtask2/Type.java
@@ -0,0 +1,5 @@
+package ru.tn.courses.ofefelov.v1.task1.subtask2;
+
+public enum Type {
+    DESKTOP, LAPTOP
+}