Calculations

operator = input()
first_num =  int(input())
second_num = int(input())


def solve(a, b, op):
    if op == 'subtract':
        result = a - b
    elif op == 'add':
        result = a + b
    elif op == 'divide':
        result = a / b
    elif op == 'multiply':
        result = a * b
    return round(result)


print(solve(first_num, second_num, operator))