import java.util.Arrays;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.OptionalInt;
import java.util.Scanner;
import java.util.Set;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		final int A = sc.nextInt();
		final int B = sc.nextInt();
		
		int min = Integer.MAX_VALUE;
		int min_A = -1;
		int min_B = -1;
		
		for(int a = 0; a <= 1000; a++){
			for(int b = 0; b <= 1000; b++){
				final int sum = a + b;
				if(sum == 0){ continue; }
				
				final int A_val = (100 * a) / (sum) + (((100 * a) % sum) * 2 >= sum ? 1 : 0);
				final int B_val = (100 * b) / (sum) + (((100 * b) % sum) * 2 >= sum ? 1 : 0);
				//System.out.println(A_val + " " + B_val);
				
				if(A_val == A && B_val == B && sum < min){
					min = sum;
					min_A = a;
					min_B = b;
				}
			}
		}
		
		System.out.println(min);
	}

}