/* -*- coding: utf-8 -*-
 *
 * 3083.cc:  No.3083 One Two - yukicoder
 */

#include<cstdio>
#include<algorithm>

using namespace std;

/* main */

int main() {
  int n;
  scanf("%d", &n);

  printf("%d\n", (n + 1) / 2);

  return 0;
}