// File: Rows.java
// Written By: Deepak Kumar
// Date: 9/29/2020
// Purpose: Show how to write nested loops
// Usage: java-introcs Rows N

public class Rows {
    public static void main(String[] args) {
        int n = Integer.parseInt(args[0]);

        for (int row = 1; row <= n; row++) {
            for (int i = 1; i <= row; i++) {
                System.out.print(i + " ");
            }
            System.out.println();
        }
    } // main()
} // class Rows