import java.math.BigInteger;
import java.util.*;
 
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[] al = new int[26];
        for(int i=0;i<26;i++){
        	al[i]=sc.nextInt();
        }
        int ans=1;
        if(al[3]<1){
        	System.out.println(0);
        	return;
        }
        ans*=al[3];
        if(al[4]<1){
        	System.out.println(0);
        	return;
        }
        ans*=al[4];
        if(al[7]<1){
        	System.out.println(0);
        	return;
        }
        ans*=al[7];
        if(al[11]<3){
        	System.out.println(0);
        	return;
        }
        int temp1=1;
        for(int i=2;i<al[11];i++){
        	temp1=Math.max(temp1, i*(i-1)/2*(al[11]-i));
        }
        ans*=temp1;
        if(al[14]<2){
        	System.out.println(0);
        	return;
        }
        int temp2=1;
        for(int i=1;i<al[14];i++){
        	temp2=Math.max(temp2, i*(al[14]-i));
        }
        ans*=temp2;
        if(al[17]<1){
        	System.out.println(0);
        	return;
        }
        ans*=al[17];
        if(al[22]<1){
        	System.out.println(0);
        	return;
        }
        ans*=al[22];
        System.out.println(ans);
    }
}