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

int main(int argc, const char * argv[]) {
    int X = 1;
    int N;
    
    cin >> N;
    
    if (N == 1) {
        cout << "0" << endl;
        return 0;
    }
    
    if ((log2(N) - (int)log2(N)) == 0) {
        cout << log2(N) << endl;
        return 0;
    }
    
    int r1= log2(N) + 1;
    int rst = r1;
    while (r1 == N) {
        r1--;
        rst++;
    }

    cout << rst + 1 << endl;
    
    return 0;
}