BOJ 2581

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

	public static void main(String[] args) throws IOException {
		BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
		int M = Integer.parseInt(bf.readLine());
		int N = Integer.parseInt(bf.readLine());
		int min = Integer.MAX_VALUE;
		int sum = 0;
		for(int i=M; i<=N; i++) {
			boolean isPrime = true;
			for(int j=2; j<i; j++) {
				if(i%j == 0) {
					isPrime = false;
					break;
				}
			}
			if(i !=1 && isPrime) {
				min = Math.min(i, min);
				sum += i;
			}
		}
		if(sum==0) {
			System.out.println(-1);
		}else {
			System.out.println(sum);
			System.out.println(min);
		}
	}

}

소수.. 2부터.. 1은 X.