#include <iostream>
#include <fstream>
#include <iomanip>
#include <string>
#include <vector>
#include <list>
#include <set>
#include <utility>
#include <queue>
#include <iterator>
#include <algorithm>
#include <cstdlib>
#include <cmath>
#include <cstdio>
#include <cstring>
using namespace std;

#define DMAX 17
#define MOD 1999999973
#define ll long long
#define ull unsigned long long

int main() {
//    freopen("input.txt", "r", stdin);
//    freopen("output.txt", "w", stdout);

    int n, cnt = 0;

    scanf("%d", &n);

    while (n % 2 == 1){
        n/= 2;
        cnt++;
    }

    printf("%d", cnt);

    return 0;
}