#include <stdio.h>
#define LIM 1000000

int main()
{
   unsigned long i;
   unsigned long sum;
   for (i = 1 ; i <= LIM; i++)
      sum += i;

   printf("%lu", sum);
   //printf("\nokay so... %lu", (unsigned long) LIM*(LIM+1)/2);

   return 0;
}