2_1_4.py

a = eval(input())
b = eval(input())
op = input()

if op == "+":
    print(a+b)
elif op == "-":
    print(a-b)
elif op == "*":
    print(a*b)
elif op == "/":
    print(a/b)
elif op == "//":
    print(a//b)
elif op == "%":
    print(a % b)