// 252K 32Ms #include<iostream> #include<cmath> #include<algorithm> #include<cstring> using namespace std; int main() { double a[6]; double ans; while(1) { double sum = 0; for(int i =0;i<6;i++) cin>>a[i]; if(a[0]==0&&a[1]==0&&a[2]==0&&a[3]==0&&a[4]==0&&a[5]==0) break; sort(a,a+6); for(int i = 1;i<5;i++) sum+=a[i]; ans = sum/4.0; cout<<ans<<endl; } return 0; }