#include<iostream>
using namespace std;
int main(){
  int a;
  cin>>a;
  if(a%2==0){
    cout<<a/2<<endl;
  }
  else{
   cout>>a/2+1<<<endl; 
  }
 return 0; 
}
#include<iostream>
using namespace std;
int main(){
  int a;
  cin>>a;
  if(a%2==0){
    cout<<a/2<<endl;
  }
  else{
   cout<<a/2+1<<endl; 
  }
 return 0; 
}