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#include <iostream>
#include <math.h>

using namespace std;
unsigned long long n=0;
unsigned long long suma=0;
unsigned long long wykladnik=0;
int main()
{
    cin >> n;
    unsigned long long t[n];
    for(unsigned long long i=0;i<n;i++)
    {
        cin >> t[i];
        suma += pow(2, t[i]);
    }
    for(unsigned long long i=0;i<suma/2;i++)
    {
       if(pow(2,i)<suma)
       {
        wykladnik += 1;
       }
    }
    cout << wykladnik;
    return 0;
}