from functools import reduce


def gauss(N):

    def sum(x, y):
        return x + y
    return reduce(sum, list(range(N + 1)))

ec85cbfce74fee2ee31676c16fd296e11d1c08b3
<mask token>

<mask token>


def gauss(N):

    def sum(x, y):
        return x + y
    return reduce(sum, list(range(N + 1)))

from functools import reduce


def gauss(N):

    def sum(x, y):
        return x + y
    return reduce(sum, list(range(N + 1)))
