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