#include <iostream>

using namespace std;
int n;
float t[101];
float maxim(int s, int d)
{
    if(s==d)
        return t[s];
    if(s<d)
    {
         int m=(s+d)/2;
         float max1, max2;
         max1 = maxim(s,m);
         max2 = maxim(m+1, d);
         if(max1<max2)
            return max2;
         return max1;
    }

}
int main()
{
   cin>>n;
   for(int i=1; i<=n; i++)
    cin>>t[i];

    cout<<maxim(1, n);


}