#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <math.h>
int main(void)
{
    int traveller;
    scanf("%d",&traveller);
    if(traveller%2==0)
    {
        printf("%d",traveller/2);
    }
    else
    {
        printf("%d",traveller/2+1);
    }
    
}