#include <iostream>
#include <math.h>
#include <stdio.h>
#include <string>
#include <string.h>
#include <algorithm>
#include <cmath>
#include <limits>
#include <sstream>
#include <iomanip>

using namespace std;

int main (void)
{
	int a,b;

	cin >> a >> b;

	double p = a * b;

	cout << fixed << setprecision(10) << p / 3.305785 << endl;
}
