#include <iostream>
#include <vector>
#include <string>
#include <cstring>
#include <math.h>
#include <cmath>
#include <limits.h>
#include <map>
#include <set>
#include <queue>
#include <algorithm>
#include <functional>
#include <stdio.h>
using namespace std;

long long MOD = 1000000007;

int main() {
    
    long long N;
    cin >> N;
    
    long long ans = 0;
    while ( N != 1 ) {
        if ( N%2 == 0 ) {
            N /= 2;
            ans++;
        }
        else {
            N++;
            ans++;
        }
    }
    
    cout << ans << endl;
    
    return 0;
}