/*本題使用遞迴的方法
 * */
import java.util.Scanner;
public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int[] nums = new int[4];
		for (int i = 0; i < 4; i++)
			nums[i] = sc.nextInt();
		sc.close();
		System.out.println(getResult(nums, 0, 0));
	}

	private static boolean getResult(int[] nums, int i, int result) {
		if (result == 24)
			return true;

		if (i < 4) {
			//加減乘除四種運算，只要其中一種返回true則運算結束，當result=0時，乘除的運算直接返回0
			return getResult(nums, i + 1, result + nums[i])
					|| getResult(nums, i + 1, result - nums[i])
					|| getResult(nums, i + 1, result == 0 ? 0 : result
							* nums[i])
					|| getResult(nums, i + 1, result == 0 ? 0 : result
							/ nums[i]);
		} else
			return false;
	}
}