#include <bits/stdc++.h>
using namespace std;
int main()
{
    cout<<fixed<<setprecision(3);
    int a[11];
    int maxn = -1,minn = 99999;
    int sum = 0;
    int sum1 = 0;
    int ans = 8;
    for(int i=1;i<=10;i++)
    {
        cin>>a[i];
        if(a[i]>maxn)
        {
            maxn = a[i];
        }
        if(a[i]<minn)
        {
            minn = a[i];
        }
        sum+=a[i];
    }
    sum1 = sum-maxn-minn;
    cout<<sum1*1.000/ans;
}