#include <iostream>
#include <cstdio>
#include <string>
#include <algorithm>
using namespace std;
int main()
{
int n,a[10004];
cin>>n;
for(int i=0;i<n;++i) cin>>a[i];
sort(a,a+n);
double ans=a[0];
for(int i=1;i<n;++i)
{
ans+=a[i];
ans/=2;
}
cout<<(int)ans;
return 0;
}