// 1113 - 判断奇偶性

include<stdio.h>

int main() {

int a,b,c;
scanf("%d",&a);
if(a%2==0)
{
	b=a/2;
	printf("%d",b);
}
if(a%2!=0)
{
	c=(a+1)/2;
	printf("%d",c);
}
return 0;

}