#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  int n;
  cin >> n;
  if ((n - 2) % 3 == 0)
    cout << n - 3 << " 2 1" << endl;
  else
    cout << n - 2 << " 1 1" << endl;
  return 0;
}
