def add(*numbers):
    s = 0
    for i in numbers:
        s += i
    print(s)

def sub(*numbers):
    s = 0
    for i in numbers:
        s -= i
    print(s)
def mult(*numbers):
    s = 1
    for i in numbers:
        s *= i
    print(s)

def div(*numbers):
    number = int(numbers[0])
    i = 1
    while i < len(numbers):
        number /= numbers[i]
        i = i + 1
    print(number)

def avg(*numbers):
    s = 0
    a = 0
    for i in numbers:
        s += i
        a+=1
    print(s/a)