TBC C++

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

int a,b,c,d;
float tbc;

int main()
{
    freopen("tbc.inp","r",stdin);
    freopen("tbc.out","w",stdout);
    cin>>a>>b>>c>>d;
    tbc = (a + b + c + d)/float(4);
    cout<<fixed<<setprecision(2)<<tbc;
}