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#include <iostream>
#include <iomanip>
#include <algorithm>
using namespace std;

int main() {
int scores[4];
for (int i = 0; i < 4; i++) {
cin >> scores[i];
}

// 排序
sort(scores, scores + 4);

// 取中间两个分数求平均
double average = (scores[1] + scores[2]) / 2.0;

cout << fixed << setprecision(2) << average << endl;

return 0;

}