# coding=utf-8
from __future__ import print_function, unicode_literals


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


def square(n):
    return n**2


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


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

# coding=utf-8
from __future__ import print_function, unicode_literals


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


def square(n):
    return n**2


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


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

# coding=utf-8