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Kornislav Solution:



import java.util.*;

public class woo {
	
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		String[] line = sc.nextLine().split(" ");
		int[] intArr = new int[4];
		for(int i = 0; i < 4; i++){
			intArr[i] = Integer.parseInt(line[i]);
		}
		Arrays.sort(intArr);
		
		System.out.println(intArr[0] * intArr[2]);
	}
	

}