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#include <iostream>
#include <vector>
using namespace std;

#define MAX 300000

int C[MAX];

int main() {
    ios::sync_with_stdio(0);

    int n;
    cin >> n;
    for(int i = 0; i < n; ++i) {
        int q;
        cin >> q;
        ++C[q];
    }

    int ret = 0;
    for(int i = 0; i < MAX; ++i) {
        if(C[i] != 0) {
            ret = i;
            C[i + 1] += C[i] / 2;
        }
    }

    cout << ret;

    return 0;
}