#include <iostream>
#include <vector>
using namespace std;
int main(){
    long long N;
    cin >> N;
    int cnt = 0;
    long long t = N;
    while(t > 0){
        if(t & 1) cnt++;
        t >>= 1; 
    }
    cnt--;
    long long ans = 0;
    int now = 0;
    t = N;
    while(t > 0){
        if(cnt == 0) break;
        if(t & 1){
            cnt--;
            ans += (1LL << now);
        }
        now++;
        t >>= 1;
    }
    long long tem = N ^ ans;
    cout << (long long)((~tem + 1) & tem) << endl;
}