题解

#include<bits/stdc++.h>
using namespace std;
int main()
{
	int a,b,c,d;
	cin>>a>>b>>c>>d;
	double sum=a+b+c+d;
	int maxv=max(max(a,b),max(c,d));
	int minv=min(min(a,b),min(c,d));
	sum=sum-maxv-minv;
	double cnt=sum/2;
	cout<<fixed<<setprecision(2)<<cnt<<endl;
	return 0;
}