#include<bits/stdc++.h>

#define ll long long
#define endl "\n"
#define pb push_back
#define printv for(auto e:v) cout << e << " ";  cout << endl;
#define printmp for(auto [x,y]:mp) cout << x << " " << y << endl; cout << endl;

using namespace std;

void solve(){
    int n, ct = 0;  cin >> n;
    ct = n;
    int emp = n;
    while(emp > 1){
        int cur = emp / 2;
        ct += cur;
        emp %= 2;
        emp += cur;
    }
    cout << ct;
}

int main(){
    ios_base::sync_with_stdio(0); cin.tie(0);
    int t = 1;  //cin >> t;
    while(t--){
        solve();
    }
    return 0;
}