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#include <iostream>

bool monety[201800] = { false };
int maxmoneta = 0;
int n, moneta;


int main() {
    scanf("%d", &n);
    for (int i=0; i<n; i++) {
        scanf("%d", &moneta);
        while (monety[moneta]) {
            monety[moneta] = false;
            moneta++;
        }
        monety[moneta] = true;
        if (moneta > maxmoneta) {
            maxmoneta = moneta;
        }
    }
    printf("%d", maxmoneta);
    return 0;
}