#include <stdio.h>

int main(void){
	int person;
	char buf[100];

	fgets(buf,sizeof(buf),stdin);
	sscanf(buf,"%d",&person);

	switch(person%2){
		case 0:
			printf("%d\n",person/2);
			break;
		case 1:
			printf("%d\n",person/2+1);
			break;
	}


	return(0);
}