#include <stdio.h>

int main()
{
   int num, count, total = 0;

   printf("Enter a value or a negative number to end: " );
   scanf("%d", &num );

   while( num >= 0 ) {
	for (count = 1; count <= num; count++)
		total = total + count;
	    
	printf("%d %d",num, total);
	printf( "Enter a value or a negative number to end:");
	scanf( "%d", &num );
	total = 0;
   }
   return 0;
}