import java.io.*;

public class NestedLoop
{
    public static void main(String [] arg) throws IOException{
        
        int num_input;
        int i,j; 
                
        BufferedReader input = 
          new BufferedReader(new InputStreamReader(System.in));
        
        System.out.println("Please input the number of lines:");
        num_input = Integer.parseInt(input.readLine());
        
        i = 1;
        
        while(i <= num_input)
        {
            j = 1;
            
            while(j <= i)
            {
                System.out.print(""+j+" ");
                j++;
            }
            // The inner loop prints out one line,
            // that is to print out 1 to i.
             
            System.out.println();
            // After the inner loop finishes 
            // printting one line,
            // we should change to a new line.
                        
            i++;
            }       
        }
}