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