#include <bits/stdc++.h>
using namespace std;

int main() {
  int N;
  cin >> N;
  for (int i = 1; i <= N / 3; i++) {
    for (int j = i; j <= N / 2; j++) {
      int k = N - i - j;
      if (k < j) break;
      if (i + j + k == N) cout << i << " " << j << " " << k << "\n";
    }
  }
}