#include <bits/stdc++.h>
using namespace std;

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
 
    int N; cin >> N;
    vector<long long> H(N);
    for(auto &h : H) cin >> h;
    sort(H.begin(),H.end());

    long long answer = 0,pos = 0,p = 1,inf = 2e18;
    while(pos < N){
        if(H.at(pos) <= 0) break;
        answer++;
        if(H.at(pos) > p) H.back() -= p;
        else pos++;
        p = min(p*2,inf);
    }
    cout << answer << endl;
}