#include <bits/stdc++.h>
using namespace std;
int main() {
  long long n;
  bool a = false;
  cin >> n;
  for (long long i = 1; i < n; i++) {
    for (long long j = 1; j < n; j++) {
      if (((n - i - j) % 3) != 0 && (i % 3) != 0 && (j % 3) != 0) {
        cout << i << " " << j << " " << (n - i - j) << endl;
        a = true;
        break;
      }
    }
    if (a) break;
  }
  return 0;
}
