#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  if (n % 3 == 0) {
    cout << n - 2 << " " << 1 << " " << 1 << endl;
  } else if (n % 3 == 1) {
    cout << n - 2 << " " << 1 << " " << 1 << endl;
  } else if (n % 3 == 2) {
    cout << n - 4 << " " << 2 << " " << 2 << endl;
  }
}
