import java.util.Scanner;

public class java3_2 {

public static void main(String[] args) {
    Scanner sc= new Scanner(System.in);
    int speedLimit = sc.nextInt();
    int yourspeed = sc.nextInt();

    int B= yourspeed-speedLimit;

    if(B>=1 && B<=20) {
        System.out.println("100");
    }else if(B>=21 && B<=30) {
        System.out.println("270");
    }else if(B>=31) {
        System.out.println("500");
    }else {
        System.out.println("0");
    }
}

}