// OK A region second tour 15/16 https://informatics.mccme.ru/mod/statements/view.php?id=18806#

# include <iostream>

using namespace std;

int main() {
    int32_t n;
    cin >> n;
    if (n % 3 == 0) {
        cout << n / 3 - 1 << ' ' << n / 3 << ' ' << n / 3 + 1;
    } else if (n % 3 == 1) {
        cout << n / 3 -  1 << ' ' << n / 3 << ' ' << n / 3 + 2;
    } else {
        cout << n / 3 - 1 << ' ' << n / 3 + 1 << ' ' << n / 3 + 2;
    }
    return 0;
}