#include<iostream>
using namespace std;

int main()
{
	int a, b, c, n;

	cin >> n;

	for (a = 1; a <= n / 3; a++)
	{
		for (b = a; b <= n / 3 + 1; b++)
		{
			if (a + 2 * b > n) break;
			
			for (c = b; c <= n - 2; c++)
			{
				if (a + b + c > n) break;

				if (a + b + c == n)
				{
					cout << a << " " << b << " " << c << endl;
				}
			}
		}
	}
}