# //comment
# another comment
def add (x,y):

    return x + y

def subtract(x,y):

    return x - y

def multiply (x,y):

    return x * y

def divide(x,y):

    if y == 0:
        raise ValueError("Can not divide by zero")
    return x/y

def addd(x,y):
    return x+y+y

