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#include <cstdio>
#include <vector>

int main() {
    int n;
    scanf("%d", &n);
    std::vector<int> a(202000, 0);
    for (int i = 0; i < n; ++i) {
        int t;
        scanf("%d", &t);
        ++a[t];
    }
    int result = 0;
    for (int i = 1; i < 202000; ++i) {
        a[i] += a[i - 1] / 2;
        if (a[i] > 0)
            result = i;
    }
    printf("%d\n", result);
    return 0;
}