import java.io.*;

class Main{

static final PrintWriter out=new PrintWriter(System.out);

public static void main(String[] arg) throws IOException{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
int[] a=new int[27];
for(int i=1;i<=26;i++) a[i]=Integer.parseInt(br.readLine());
int d=a[4];
int e=a[5];
int h=a[8];
int l=a[12];
int o=a[15];
int r=a[18];
int w=a[23];
int o1=o/2;
o=o1*(o-o1);
long l1=0;
if(l>=3){
int t=(int)((l+1+Math.sqrt(l*(l-1)-1))/3);
l1=Math.max(l1,l-2);
l1=Math.max(l1,combination(t,2)*(l-t));
l1=Math.max(l1,combination(t+1,2)*(l-t-1));
}
else l1=0;
out.println(d*e*h*l1*o*r*w);
out.flush();
}

private static long combination(int a,int b){
if(b==0||b==a) return 1;
if(b==a-1||b==1) return a;
if(a/2>=b) return fact(a,a-b+1)/fact(b,1);
else return combination(a,a-b);
}

private static long fact(int a,int b){
if(a==b) return b;
return a*fact(a-1,b);
}
}