#include<stdio.h>

int main( )
{
    double a,b,c;

    scanf( "%lf", &a );
    scanf( "%lf", &b );

    c = ( ( a * 3.5 ) + ( b * 7.5 ) ) / 11;

    printf( "MEDIA = %.5lf\n", c );

    return 0;
}