def add(num1,num2):
    result=num1*num2
    print(result)
add(100,200)

def mul(num1,num2):
    res=num1*num2
    print(res)
mul(100,200)


def sub(num1,num2):
    res=num1-num2
    print(res)
sub(100,200) #combine cheyathekuna program calc