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

const int maxn = 201730;

bool cnt[maxn*2];
int n, x, cmax;

int main() {
    cin >> n;
    for(int i = 0; i < n; i++) {
        cin >> x;
        while(cnt[x]) {
            cnt[x] = 0;
            x++;
        }
        cnt[x] = 1;
        cmax = max(cmax, x);
    }
    cout << cmax << endl;
}