#include<cstdio>
#include<cmath>
#include<algorithm>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<cstdlib>
#include<iomanip>
#include<queue>
#include<set>
#include <valarray>
#include<stack>
#include<sstream>
#include<math.h>
   
using namespace std;
   
void Solution()
{
   int a, b;
    
    cin>>a>>b;
    
    cout<<fixed<<setprecision(4)<<(double)a * b / 3.305785 <<endl;
}
   
int main()
{
    Solution();
    return 0;
}