#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(int)(n);i++)
using namespace std;
using ll = long long ;
using P = pair<int,int> ;
using pll = pair<long long,long long>;
constexpr int INF = 1e9;
constexpr long long LINF = 1e17;
constexpr int MOD = 1000000007;
int n;
map<int,int> dp;

int dfs(int x){
    if(dp.count(x) > 0) return dp[x];
    if(x%2==0) return dp[x] = 1 + dfs(x/2);
    return dp[x] = 1 + dfs(x-1);
}

int main(){
    cin >> n;
    dp[1] = 0;
    cout << dfs(n) << endl;
    return 0;
}