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