#include <bits/stdc++.h>
using namespace std;
const int inf = 1 << 30;
const long long INF = 1ll << 60;
const double pi = acos(-1);
const double eps = 1e-9;
const long long mod = 1e9 + 7;
const int dx[4] = {0, 1, 0, -1}, dy[4] = {1, 0, -1, 0};
long long n;
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  cin >> n;
  if (n % 3 == 2)
    cout << 1 << ' ' << 2 << ' ' << n - 3 << endl;
  else
    cout << 1 << ' ' << 1 << ' ' << n - 2 << endl;
}
