
#
#
# def privet(x):
#     if x == 0:
#       return
#     else:
#      print("hello world")
#      privet(x-1)
#
# privet(10)
#
# def sum(x):
#     if x == 0:
#       return 0
#     elif x == 1:
#       return 1
#     else:
#       return x + sum(x - 1)
#
#
# print(sum(5))

