#include <iostream>

using namespace std;

int main()
{
    int N;
    int count = 0;
    cout << "Input N: ";
    cin >> N;

    for (int i = 1; i <= N; i++)
        for (int j = 1; j <= i; j++)
            for (int k = 1; k <= j; k++)
            {
                count++;
                cout << count << endl;
            }

    return 0;
}