Guzgu sade ededler

import java.util.Scanner;

public class Main {

    public boolean dPrime(int n) {
        if (n == 1) return false;
        if ( n==2 ) return true;
        if (n%2==0) return false;
        for(int i=3;i*i<=n;i+=2) {
            if(n%i==0)
                return false;
        }
        return true;
    }

    public int reverse(int n){
        int reverse = 0;
        for (; n!=0; n/=10){
            reverse *= 10;
            reverse += n%10;
        }
        return reverse;
    }


    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        Main obj = new Main();
        int SP = scan.nextInt(), EP = scan.nextInt(), say = 0;
        for (int i = SP; i <= EP; i++){
            if (obj.dPrime(i)){
                if (obj.dPrime(obj.reverse(i))) say++;
            }
        }
        System.out.println(say);
    }
}