a = float(input())
operation = input("Операция (+, -, *, /): ")
b = float(input())

if operation == "+":
    print(a+b)

elif operation == "*":
    print(a*b)

elif operation == "-":
    print(a-b)

elif operation == "/":
    print(a/b)

else:
    print("Ошибка")