#include <iostream>
#include <vector>
#include <list>
#include <algorithm>
#include <string>
#include <sstream>
#include <stack>
#include <iomanip>
#include <numeric>
#include <queue>
#include <climits>
#include <set>
#include <complex>
#include <cmath>
#include <cstring>
#include <map>
using namespace std;
using ll = long long;
#define MOD 1000000007
#define INF 1LL << 59
using ld = long double;

int main()
{
    //std::ios::sync_with_stdio(false);
    //std::cin.tie(0);
    cout << fixed << setprecision(6);

    long double a, b;
    while (cin >> a >> b)
    {
        cout << (long double)a / 3.305785 * b << endl;
    }
    return 0;
}
