from operator import add, sub, truediv, mul, mod, pow, floordiv

operations = {'+': add, '-': sub, '/': truediv, '*': mul, 'mod': mod, 'pow': pow, 'div': floordiv}

a = float(input())
b = float(input())
operator = input()

try:
    print(operations[operator](a, b))
except ZeroDivisionError:
    print("Деление на 0!")