#include <stdio.h>
#include "genlib.h"
#include "simpio.h"

main() {
   int i, total, n ;

   printf("Enter a number: ") ;
   n = GetInteger() ;
   total = 0 ;

   for (i = 1 ; i <= n ; i+=2) {
      total += i ;
   }

   printf("Answer is: %d\n", total) ;
}