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#include <iostream>
#include <cstdio>
using namespace std;

int lot[ 202000 ];

int main()
{
    int n, x, maks = 0;
    scanf( "%d", &n );

    for ( int i = 0; i < n; ++i )
    {
        scanf( "%d", &x );
        if ( x > maks ) maks = x;
        lot[ x ]++;
    }

    for ( int i = 0; i <= maks; ++i )
    {
        lot[ i + 1 ] += lot[ i ] / 2;
        if ( i == maks && lot[ i + 1 ] ) maks++;
    }

    printf( "%d", maks );

}