#include<bits/stdc++.h>
using namespace std;

int main(){
    vector<int> v;
    int in;
    double ans=0.0;

    while(cin >> in) v.push_back(in);
    sort(v.begin(), v.end());

    v.erase(v.begin(),v.begin()+1);
    v.pop_back();

    printf("%.2f\n",(double)accumulate(v.begin(),v.end(),0.0)/v.size()); 

    return 0;
}