#include <iostream>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

using namespace std;
int main(int argc, char** argv) {
 
 int n, m;
 
 while(cin >> n >> m)
 {
  cout << (n/3)*(m/3) << endl; 
 }
 return 0;
}