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

int main(int argc, const char * argv[]) {
    int N; cin >> N;
    int rst, workingValue;
    if ((log2(N) - (int)log2(N)) > 0) {
        rst = (int)log2(N) + 1;
        rst += ((int)pow(2, rst) - N);
        cout << rst << endl;
        return 0;
    } else {
        cout << log2(N) << endl;
        return 0;
    }
    
    return 0;
}