#include<iostream>
#include<math.h>
#include<vector>
#include<algorithm>
#include<cstdio>
using namespace std;
 
 
int main(){
 
    double a,b;
    scanf("%lf %lf",&a,&b);
 
    printf("%.6lf\n",(a*b)/3.305785);
 
    return 0;
}
