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#include <cstdio>

int n, g, x, out;
int t [300001];

int main ()
    {
    scanf ("%d",&n);
    for (g=0; g!=n; g++)
        {
        scanf ("%d",&x);
        t[x]++;
        }
    for (g=0; g!=300000; g++)
        {
        if (t[g]!=0)
            out=g;
        t[g+1]+=(t[g]/2);
        }
    printf ("%d\n",out);
    return 0;
    }