#include <stdio.h>
#include <string>
#include <cstring>
#include <stdlib.h>
#include <math.h>
#include <algorithm>
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <list>
#include <iterator>
#include <assert.h>
#pragma warning(disable:4996) 
 
typedef long long ll;
#define MIN(a, b) ((a)>(b)? (b): (a))
#define MAX(a, b) ((a)<(b)? (b): (a))
#define LINF 9223300000000000000
#define INF 2140000000
const long long MOD = 1000000007;
using namespace std;

int main(int argc, char* argv[])
{
    int n;
    scanf("%d", &n);

    int cnt=0;
    while(n!=1) {
        if(n%2==0) {
            n/=2;
        }
        else {
            n+=1;
        }
        cnt++;
    }
    printf("%d\n", cnt);
    return 0;
}