#include <stdio.h>
#include <time.h>
#include <limits.h>

int main(void)
{
//   int i = 25;
   double sum = 0.0;
   unsigned long start = (unsigned long) time(NULL);
   printf("Start: %lu\n", start);
   for (register int k = 1; k < UINT_MAX; k++) {
      sum += k;
   }
   unsigned long end = (unsigned long) time(NULL);
   printf("End: %lu\n", end);

   printf("Time: %lu\n", end - start);
   return 0;
}