diff --git a/.idea/misc.xml b/.idea/misc.xml
index d15472f..7464918 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_18" default="true" project-jdk-name="openjdk-18" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_19" default="true" project-jdk-name="openjdk-19" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
 </project>
\ No newline at end of file
diff --git a/src/lab1.java b/src/lab1.java
new file mode 100644
index 0000000..a8f7181
--- /dev/null
+++ b/src/lab1.java
@@ -0,0 +1,45 @@
+import java.util.Scanner;
+public class lab1 {
+    public static void main(String[] args){
+        Scanner scanner = new Scanner(System.in);
+
+        // 2131 % 7 = 3; C7 = long
+        long n, m, a, b;
+        float result, sum;
+        while(true) {
+            try {
+                System.out.println("Введіть n типу long:");
+                n = scanner.nextLong();
+                System.out.println("Введіть m типу long:");
+                m  = scanner.nextLong();
+                System.out.println("Введіть a типу long:");
+                a  = scanner.nextLong();
+                System.out.println("Введіть b типу long:");
+                b  = scanner.nextLong();
+                break;
+            }catch(Exception e){
+                scanner.nextLine();
+                System.out.println("Введене неправильне число");
+            }
+        }
+
+        // 2131 % 5 = 1; O2 = /
+        // 2131 % 2 = 1; O1 = -
+        // 2131 % 3 = 1; C = 1
+        result = 0;
+        byte C = 1;
+        for(long i = a; i <= n; i++){
+            sum = 0;
+            for(long j = b; j <= m; j++){
+                if (i - C == 0 || j == 0){
+                    System.out.println("Помилка ділення на 0");
+                    System.exit(0);
+                }
+                sum += (float) (i/j)/(i-C);
+            }
+            result += sum;
+        }
+        System.out.println(result);
+
+    }
+}