 #include <bits/stdc++.h>

#define rep(i,n) for (int i = 0; i < (n); ++i)

using namespace std;

using ll = long long;

using P = pair<int,int>;


int main() {
 
  int n;
  cin >> n;
 


cout << (n+1)/2<endl ;
  return 0;

}

