#include <algorithm>
#include <iomanip>
#include <iostream>
#include <vector>

using namespace std;

typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef pair<int, int> pii;

#define reps(i,f,n) for(int i=f; i<int(n); ++i)
#define rep(i,n) reps(i,0,n)


int main()
{
    int a, b;
    cin >> a >> b;
    cout << setprecision(15) << a*b/3.305785 << endl;
}