diff --git a/src/java/lesson1/classwork/Conditions.java b/src/java/lesson1/classwork/Conditions.java
new file mode 100644
index 0000000..ba9ea43
--- /dev/null
+++ b/src/java/lesson1/classwork/Conditions.java
@@ -0,0 +1,38 @@
+package lesson1.classwork;
+
+import java.util.Scanner;
+
+public class Conditions {
+    public static void main(String[] args) {
+        Scanner in = new Scanner(System.in);
+//        System.out.println("Введите а");
+//        int a = in.nextInt();
+//        System.out.println("Введите b");
+//        int b = in.nextInt();
+//        System.out.println("Большее из двух: ");
+//        if (a > b) {
+//            System.out.println("a");
+//        } else {
+//            System.out.println("b");
+//        }
+        //  1     2     3       4
+        //.....0.....7.....12........
+        int x = in.nextInt();
+        if (x < 0) {
+            System.out.println("1");
+        } else if (x < 7) {
+            System.out.println("2");
+        } else if (x < 12) {
+            System.out.println("3");
+        } else {
+            System.out.println("4");
+        }
+
+//        if (x < 0) {}
+//        if (x >= 0 && x < 7){}
+//        if (x >= 7 && x < 12){}
+//        if (x >= 12){}
+        boolean condition1 = x > 7, condition2 = x < 12;
+        //>, <, >=, <=, ==, !=
+    }
+}
diff --git a/src/java/lesson1/classwork/Functions.java b/src/java/lesson1/classwork/Functions.java
new file mode 100644
index 0000000..da71477
--- /dev/null
+++ b/src/java/lesson1/classwork/Functions.java
@@ -0,0 +1,20 @@
+package lesson1.classwork;
+
+public class Functions {
+
+    static int funcName(int a, int b) {
+        return a + b;
+    }
+
+    static int foo(long a) {
+        return (int)a;
+    }
+
+    static void print(int a) {
+        System.out.println(a);
+    }
+
+    public static void main(String[] args) {
+        print(12);
+    }
+}
diff --git a/src/java/lesson1/classwork/Main.java b/src/java/lesson1/classwork/Main.java
new file mode 100644
index 0000000..60b74b7
--- /dev/null
+++ b/src/java/lesson1/classwork/Main.java
@@ -0,0 +1,31 @@
+package lesson1.classwork;
+
+import java.math.BigInteger;
+
+public class Main {
+    public static void main(String[] args) {
+        //примитивные типы данных
+        //integers
+        byte b = -128; //1b = 8bit (2 ** 8 = 256)
+        //[-128; 128) -128 ... - 1 0 1 2 3 ... 127
+        short sh = 32736; // 2b = 16 bit
+        // [-2 ** 15; 2 ** 15)
+        int i = 2_000_000_000; // 4b = 32 bit
+        long l = 1_000_000_000_000_000_000L; // 8b = 64 bit
+        System.out.println(l);
+        // 10 ** 18
+        //BigInteger bi = new BigInteger("0");
+        //floating point
+        final int a = 12;
+        float f = 121212.6565656f; // 4 b
+        double d = 121212.6565656; // 8 b
+        char c = 's';// ' " \
+        System.out.println((char)(c + 1));
+        boolean bool = c < 'S' + 33;
+        //boolean b1;
+        System.out.println(bool);
+        String str = "+79112756975";
+        System.out.println(str.matches("\\+7[0-9]{10}"));
+    }
+
+}
diff --git a/src/java/lesson1/classwork/Mat.java b/src/java/lesson1/classwork/Mat.java
new file mode 100644
index 0000000..f5b6b47
--- /dev/null
+++ b/src/java/lesson1/classwork/Mat.java
@@ -0,0 +1,24 @@
+package lesson1.classwork;
+
+public class Mat {
+    public static void main(String[] args) {
+        int x = 5, y = 3;
+        float xf = 5, yf = 3;
+        System.out.println(x / y);
+        System.out.printf("%.16f\n", xf / yf);
+        // + - * / (% - остаток) >> <<
+        //++ -- += /= *= %=
+        //System.out.println(++x);
+        System.out.println(x);
+        x = x++ + ++x; //5 = 5(6) + 7 = 12
+        System.out.println(x);
+        x -= 5; x += 2; x *= 2; x /= 3;
+        x = x % 4;
+        System.out.println(x);
+        x = 12;
+        System.out.println(Integer.toBinaryString(x));
+        x <<= 3; // x = x << k <=> x = x * (2 ** k)
+        System.out.println(x);
+        System.out.println(Integer.toBinaryString(x));
+    }
+}