#include<iostream>
#include<string>
#include<vector>
#include<cstdio>
#include<sstream>
#include<algorithm>
#include<cmath>
#include<map>
#include<functional>
using namespace std;
int stoi(string x){stringstream ss;ss<<x;int tmp;ss>>tmp;return tmp;}
string itos(int x){stringstream ss;ss<<x;return ss.str();}
int main(){
	int a,b;
	while(scanf("%d%d",&a,&b)!=EOF){
	double ans=a*b;
	printf("%.10lf",ans/3.305785);
	}
	return 0;
}