import java.util.*;
import java.io.*;

public class Main {
    public static void main(String[] args) throws Exception {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String[] first = br.readLine().split(" ", 2);
        int a = Integer.parseInt(first[0]);
        int b = Integer.parseInt(first[1]);
        int min = Integer.MAX_VALUE;
        for (int i = 0; i <= 100; i++) {
            for (int j = 0; j <= 100; j++) {
                if (i == 0 && j == 0) {
                    continue;
                }
                if ((100 * i + (i + j) / 2) / (i + j) == a && (100 * j + (i + j) / 2) / (i + j) == b) {
                    min = Math.min(min, i + j);
                }
            }
        }
        System.out.println(min);
    }
}