import java.util.*;

public class Main {
	public static void main (String[] args) {
    	Scanner sc = new Scanner(System.in);
    	int a = sc.nextInt();
    	int b = sc.nextInt();
    	if (a == 0 && b == 0) {
    	    System.out.println(0);
    	}
    	int ansA = Integer.MAX_VALUE;
    	int ansB = Integer.MAX_VALUE;
    	for (int i = 0; i <= 200; i++) {
    	    for (int j = 0; j <= 200; j++) {
    	        if (i == 0 && j == 0) {
    	            continue;
    	        }
    	        int tmpA = 1000 * i / (i + j);
    	        if (tmpA % 10 >= 5) {
    	            tmpA += 10;
    	        }
    	        tmpA /= 10;
     	        int tmpB = 1000 * j / (i + j);
    	        if (tmpB % 10 >= 5) {
    	            tmpB += 10;
    	        }
    	        tmpB /= 10;
    	        if (tmpA == a && tmpB == b) {
    	            ansA = Math.min(ansA, i);
    	            ansB = Math.min(ansB, j);
    	            break;
    	        }
    	    }
    	}
    	System.out.println(ansA + ansB);
	}
}