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

int main() {
    int N, X = 1, ans = 0;
    cin >> N;
    for(; X < N;) {
        X = X << 1;
        ans++;
    }
    if(X != N) {
        ans += X - N;
    }
    cout << ans << '\n';
    return 0;
}