#include <iostream>
using namespace std;
long long a[26];
int main(){
	for(int i = 0; 26 > i; i++){
		cin>>a[i];
	}
	//cout << a[3] << " " << a[4] << " " << a[7] << " " << a[17] << " " << a[22] << " " << a[14] << " " << a[11] << endl;
	//cout << a[3]*a[4]*a[7]*a[17]*a[22]*(a[14]/2)*(a[14]/2+a[14]%2) << " " <<(a[11]/3) << " " << (a[11]/3+(a[11]%3?1:0)) << " " << (a[11]/3+(a[11]%3==2?1:0)) << endl;
  long long ans =  a[3]*a[4]*a[7]*a[17]*a[22]*(a[14]/2)*(a[14]/2+a[14]%2);
  long long mx = 0;
  for(int i = 1; a[11]-2 >= i; i++){
    //a[11]-i,i
    mx = max(mx,i*(a[11]-i)*(a[11]-i-1)/2);
  }
  cout << ans*mx << endl;
}