백준 2839

jaegeunsong97·2023년 3월 3일
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import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args) throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringTokenizer st = new StringTokenizer(br.readLine());
        int N = Integer.parseInt(st.nextToken());
        
        int answer = 0;
        while (true) {
            if (N % 5 == 0) {
                answer += N / 5;
                break;
            } else {
                N -= 3;
                answer++;
            }
            
            if (N < 0) {
                answer = -1;
                break;
            }
        }
        
        
        System.out.println(answer);
    }
}
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