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#include <iostream>

using namespace std;
void dodaj(bool *T,int x)
{
if (!T[x]) T[x]=true;
else
    {T[x]=false;
      dodaj(T,x+1);
    }
}
int main ()
{
  ios_base::sync_with_stdio(0);
      cin.tie(0);

int C=201739;
bool * T = new bool [C];
for (int i=0;i<C;++i)
    T[i]=false;


int coin;
cin>>coin;
while (cin>>coin)
{
dodaj(T,coin);
}
for (int i=C-1;;--i)
if (T[i]==true)
      {cout<<i;return 0;}

return 0;
}