diff --git a/calc.py b/calc.py
index 6f0b857..1de5f15 100644
--- a/calc.py
+++ b/calc.py
@@ -1,2 +1,45 @@
-print("world says hallo")
-print("hello to worlds")
\ No newline at end of file
+def main():
+    print("Welcome to the Calculator")
+    command = input("Select command: + or *\nType exit if u want exit \n")
+    match command:
+        case "+":
+            summ()
+            main()
+        case "*":
+            multiplication()
+            main()
+        case "exit":
+            exit
+        case _:
+            print(KeyError("Incorrect"))
+            main()
+def summ():
+    print("Enter number to sum, enter space to finish")
+    total = 0
+    while True:
+        num_input = input()
+        if num_input == " ":
+            print (total)
+            main()
+        try: 
+            number = float(num_input)
+            total += number
+            print(f"Total summ = {total}")
+        except ValueError:
+            print("Error, enter correct number")
+def multiplication():
+    print("Enter number to multiplication, enter space to finish")
+    total = 0
+    while True:
+        num_input = input()
+        if num_input == " ":
+            print (total)
+            main()
+        try: 
+            number = float(num_input)
+            total *= number
+            print(f"Total multiplication = {total}")
+        except ValueError:
+            print("Error, enter correct number")
+if __name__ == "__main__":
+    main()