#include <stdio.h>
int main() 
{
   int i, j, rows;
   printf("Enter the number of rows: ");
   scanf("%d", &rows);
   for (i = 0; i <= rows; ++i) 
   {
        for (j = 1 ; j <= i; ++j)
      {
        printf("%d ", j);
      }
    printf("\n");
   }
   return 0;
}