def add(a,b):
    c = a+b
    return c

def sub(a,b):
    c = a-b
    return c

def mul(a,b):
    c = a*b
    return c

def div(a,b):
    c = a/b
    return c

print(add (1,2))
print(sub (1,2))
print(mul (1,2))
print(div (1,2))
