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#include <iostream>

using namespace std;

int main() {
    int n = 0;
    int powersLength = 201719;
    int* powers = new int[powersLength];
    cin >> n;
    for (int i = 0; i < n; i++) {
        int power;
        cin >> power;
        powers[power] += 1;
    }
    for (int i = 0; i < powersLength - 1; i++) {
        int a = powers[i] / 2;
        powers[i+1] += a;
    }
    int lastPower;
    for (int i = powersLength - 1; i >= 0; i--) {
        if (powers[i] != 0) {
            lastPower = i;
            break;
        }
    }
    cout << lastPower;
    return 0;
}