# def sum(n):
#     sum = 0
#     for i in range(1, n + 1):
#         sum += i
#     return sum


# def power(x, n):
#     prod = 1
#     for i in range(1, n + 1):
#         prod = prod * x
#     return prod

# if __name__ == '__main__':
#   print('{0}'.format(__name__))
#   print(sum(5))
#   print(power(5,2))
