View Code of Problem 27

import java.util.Scanner;

public class Main {
	public static boolean su(int num) {
		if(num == 1) {
			return false;
		}
		else {
			for(int i = 2;i <= Math.sqrt(num);i++) {
				if(num % i == 0) {
					return false;
				}
			}
			return true;
		}
	}
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		while(scanner.hasNext()) {
			int a = scanner.nextInt();
			int b = scanner.nextInt();
			int sum = 0;
			if( a > b) {
				int temp = a;
				a = b;
				b = temp;
			}
			for(int i = a + 1;i < b;i++) {
				if(su(i)) {
					sum += i;
				}
			}
			System.out.println(sum);
		}
	}
}