#include <stdio.h>
int main()
{
   int rows;
   printf("Enter the number of rows: ");
   scanf("%d",&rows);
   CalculTri(rows);
}

void CalculTri(int rows)
{
	int i,k=0,count=0,count1=0,space;
	   for(i=1;i<=rows;++i)   
	   {
		   for(space=1;space<=rows-i;++space)
		   {
			  printf("  ");
			  ++count;
			}
			while(k!=2*i-1)
			{
			   if (count<=rows-1) 
			   {
				 printf("%d ",(i+k));
				 ++count;
			   }
			   else
			   {
				 ++count1;
				  printf("%d ", (i+k-2*count1)); 
			   }
			   ++k;
			}
			count1=count=k=0;
			printf("\n");
		}
		return 0;
}