package no339;

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int p = sc.nextInt();
		int q = sc.nextInt();
		for(int sum=1;;sum++) {
			for(int a=0;a<=sum;a++) {
				int b = sum - a;
				int p2 = divRound(100 * a, a + b);
				int q2 = divRound(100 * b, a + b);
				if (p == p2 && q == q2) {
					System.out.println(sum);
					return;
				}
			}
		}
	}
	
	public static int divRound(int a,int b) {
		return a / b + (a % b >= (b + 1) / 2 ? 1 : 0);
	}

}