#include <string>
#include <vector>
#include <algorithm>
#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <queue>
#include <typeinfo>
#include <map>
#define INF 100000000
#define rep(i,a) for(int i=0;i<(a);i++)

using namespace std;
typedef long long ll;





int main(){
    ll a,b;
    while(cin>>a>>b){
        ll sum=a*b;
        printf("15.10lf%\n",sum/3.305785);
    }
    return 0;
}