// editor3
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("Invalid input");
        }
        else{
            int Battery=((a - b) * 100) / a;
            System.out.println(Battery + "%");
        }
    }
}

/*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("Invalid Input");
        } else {
            int Battery = ((a - b) * 100) / a; 
            System.out.println(Battery + "%");
        }
    }
}*/