#include <iostream>
using namespace std;
#include <bits/stdc++.h>
#define max 7
//冒泡排序,升序
void sort(int arr[], int length) {
for (int i = 0; i < length - 1; i++) {
for (int j = 0; j < length - i - 1; j++) {
if (arr[j] > arr[j + 1]) {
int temp = arr[j];
arr[j] = arr[j + 1];
arr[j + 1] = temp;
}
}
}
}
int main() {
int arr[max] = { 0 }; //定义数组记录成绩
while (cin >> arr[0] >> arr[1] >> arr[2] >> arr[3] >> arr[4] >> arr[5] >>
arr[6]) {
sort(arr, max); //升序排序
cout << fixed << setprecision(2) << (arr[1] + arr[2] + arr[3] + arr[4] +
arr[5]) / 5.0 << endl;
}
system("pause");
return 0;
}