#! /usr/bin/env python3

N = int(input())
a = b = c = 1
n = N - 2
c = n
while 1:
    if a + b + c == N : print(a, b, c)
    if b < c - 1:
        b += 1
        c -= 1
    elif b == c - 1:
        a = 2
        b = 2
        n -= 2
        c = n
    elif a < b - 1:
        a += 1
        b -= 1
    else:
        break