#include <stdio.h>
#include <iostream>
#include <algorithm>
#include <iomanip>

int n;

using namespace std;


int main(){
    int a,b;
    while(cin>>a>>b){
        float ab = (float)a*(float)b;
        cout<<setprecision(16)<<ab/3.305785<<endl;
       
    }
}