拒绝分支，从我做起！！！

#include <bits/stdc++.h>
using namespace std;
int main()
{
    int a[4];
    cin>>a[0]>>a[1]>>a[2]>>a[3];
    sort(a, a + 4);
    double sum = a[1] + a[2];
    sum /= 2.00;
    cout << fixed << setprecision(2) << sum;
    return 0;
}