#include<bits/stdc++.h>
using namespace std;

const long long INF = 1LL << 60;
#define MOD 1000000007;

typedef long long ll;

#define writeln(n) cout<<n<<endl;

typedef pair<int, int> P;

typedef pair<string, int> Psi;


int main() {

	int n;
	cin>>n;


	int ans = n/2;
	
	if(n%2 ==0){
		writeln(ans);
	}else {
		writeln(ans+1);
	}
}