#include <iostream>
#include <string>
#include <cstdio>

using namespace std;

int main()
{
    double a,b,avg; //用float会WA,精度不够要用double
    cin>>a>>b;
    avg=(a*3.5+b*7.5)/11;
    printf("MEDIA = %.5lf",avg);

    return 0;
}