#include <iostream>
#include <iomanip>
using namespace std;
int main() {
int a = 0;
int min=100;
for (int i = 1; i <= 5; i++)
{
int ocena;
cin >> ocena;
a = a + ocena;
if (a < min) min = a;
}
a = a - min;
double prosek = a / 4;
cout << fixed <<setprecision(2) << prosek;
return 0;
}
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