#include <fstream>
#include <ctime>
#include <iomanip>
#include <cstring>
#include <cstdlib>
using namespace std;
int x,y,i,n;
long long trei;
long double s=28.928571;
int main()
{
    ifstream fi("minesweeper.in");
    ofstream fo("minesweeper.out");
    srand(time(NULL));
    fi>>x>>y;
    trei=1; n=x*y;
    for(i=1;i<=n-3;i++) trei*=3;
    fo<<setprecision(6);
    fo<<fixed<<(double)s*trei<<"\n";
    return 0;
}