import java.util.Scanner;

public class Main  {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int[] C = new int[26];
		for(int i = 0; i < 26; i++) {
			C[i] = scan.nextInt();
		}
		scan.close();

		// d  e  h  l  o  r  w
		// 3  4  7  11 14 17   22

		long ans = (long)C[3] * C[4] * C[7] * C[17] * C[22];

		long max1 = 0;
		for(int i = 2; i < C[11]; i++) {
			long t = (i * (i - 1))*(C[11] - i) / 2;
			max1 = Math.max(max1, t);
		}

		long max2 = 0;
		for(int i = 1; i < C[14]; i++) {
			long t = i * (C[14] - i);
			max2 = Math.max(max2, t);
		}
		ans = ans * max1 * max2;
		System.out.println(ans);
	}
}