#include <iostream>
#include <iomanip>
using namespace std;
int main() {
double x, y, MEDIA;
cin >> fixed >> setprecision(1);
cin >> x >> y;
MEDIA = ((x * 3.5) + (y * 7.5)) / (3.5 + 7.5);
cout << fixed << setprecision(5);
cout << "MEDIA = " << MEDIA << endl;
return 0;
}
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