백준 2581 java 자바

https://www.acmicpc.net/problem/2581

2581번: 소수

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

public class Main {
 
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int frst = Integer.parseInt(br.readLine());
        int scd = Integer.parseInt(br.readLine());
        int min=0,total=0,tmp=0;
        
        
        for(int i=frst; i<=scd; i++) { 
        	if(i==1)
        		continue;
        	boolean isPrime=true;
        	for(int j=2; j<i; j++) {
                if(i % j == 0) {
                    isPrime = false;                   
                    break;
                }              
            }
        	if(isPrime) {
                total+=i;
                tmp++;
            }
        	
        	if(tmp==1&&isPrime) {
        		min=i;
        	}
        		
        }
        if(total==0)
        	System.out.println(-1);
        else {
        	System.out.println(total);
        	System.out.println(min);
        }
    }
 
}