def addition(num1, num2):
    return num1 + num2

def subtract(num1, num2):
    return num1 - num2

def multiplication(num1, num2):
    return num1 * num2

def division(num1, num2):
    return num1 / num2

def modulus(num1, num2):
    return num1 % num2

def division_int(num1, num2):
    return num1 // num2

def exponent(num1, num2):
    return num1 ** num2

def arithmetic(postfix_exp):
    exp = postfix_exp

