#include <stdio.h>

double L=1.0423, d, y, mean=0;

int main() {
    
    scanf("%lf %lf", &d, &y);
    printf("%lf\n", d*y/L*10000/6);
    mean+=d*y/L*10000/6;

    scanf("%lf %lf", &d, &y);
    printf("%lf\n", d*y/L*10000/12);
    mean+=d*y/L*10000/12;

    scanf("%lf %lf", &d, &y);
    printf("%lf\n", d*y/L*10000/3);
    mean+=d*y/L*10000/3;

    scanf("%lf %lf", &d, &y);
    printf("%lf\n", d*y/L*10000/6);
    mean+=d*y/L*10000/6;

    printf("\nfinal : %lf", mean/4);
    

    /*
        0.25 1.251
0.50 1.393
0.25 0.676
0.50 0.660
    */
}