#include <bits/stdc++.h>
int main(void) {
  int n, a, b;
  printf("n> ");
  scanf("%d", &n);
  a = n / 2;
  b = n / 2 + 1;
  if (n % 2 == 0) {
    printf("%d\n", a);
  } else {
    printf("%d\n", b);
  }
  return 0;
}
