#include "cyccounter.h"
#include <stdio.h>

int main(int argc, char *argv[]){
  cycles start, stop;
  int i, n;
  
  scanf("%d", &n);
  start = read_cyccounter();
  i = 0;
 loop:
  if(i >= n){
    goto loopEnd;
  }
  i++;
  goto loop;
 loopEnd:
  stop = read_cyccounter();
  printf("%llu\n", stop - start);
  return 0;
}