//

#include <stdio.h>
#include <stdlib.h>
#include <iostream>
#include <vector>
#include <string>
#include <queue>
#include <algorithm>
#include <math.h>
#include <utility>
#include <set>
#include <map>
#define INF 100000
#define rep(i,n) for(int i =0;i<n;i++)
using namespace std;
typedef long long int ll;

#define MAX 5000


int main(){
    double a,b;
    cin >>a>>b;
    double ans = (a*b*1000000)/3305785;
    printf("%.5f",ans);
    cout <<endl;
}