def main():
    N = int(input())

    a = N // 3
    b = (N - 1) // 2
    c = N - 2

    for i in range(1, a + 1):
        for j in range(1, b + 1):
            for k in range(N - a - b, c + 1):
                if i + j + k == N and i <= j <= k:
                    print(i, j, k)

main()