#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000001

int main() {
    
	int n;
	cin>>n;
	
	if(n%2==1)cout<<1<<endl;
	else cout<<n/2<<endl;
	
    return 0;
}