#include<bits/stdc++.h>
#define rep(i,a,b) for(int i=int(a);i<int(b);++i)
using namespace std;
typedef long long ll;
int INF = (1LL << 30) - 1;
int MOD = 1e9+7;
main(){
    ll N,cnt = 0;
    cin >> N;
    while(N != 1){
        if(N & 1){
            N++;
            cnt++;
        }
        N /= 2;
        cnt++;
    }
    cout << cnt << endl;
}