ABC354

h = int(input())
now, day = 0, 0
while now <= h:
    now += 1<<day 
    day += 1
print(day)

#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (n); ++i)

using namespace std;

int main() {
    int n;
    cin >> n;
    
    vector<pair<string, int>> user;
    int t = 0;
    rep(i, n) {
        string s; int c;
        cin >> s >> c;
        user.emplace_back(s, c);
        t += c;
    }
    
    sort(user.begin(), user.end());
    
    string ans = user[t%n].first;
    cout << ans << '\n';
    
    return 0;
}

#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (n); ++i)

using namespace std;

int main() {
    int n;
    cin >> n;
    
    vector<int> a(n), c(n);
    rep(i, n) cin >> a[i] >> c[i];
    
    vector<int> is(n);
    iota(is.begin(), is.end(), 0);
    sort(is.begin(), is.end(), [&](int i, int j) {
        return a[i] > a[j]; 
    });
    
    vector<int> ans;
    for (int i : is) {
        if (!ans.size() or c[ans.back()] > c[i]) {
            ans.push_back(i);
        } 
    }
    
    sort(ans.begin(), ans.end());
    
    cout << ans.size() << '\n';
    for (int i : ans) cout << i+1 << ' ';
    
    return 0;
}