코드포스 478A (codeforces 478A)
Algorithms / 코드포스 (codeforces)
Codeforces Codeforces 478a 코드포스 코드포스 478a Problem - 478a - codeforces
코드포스 478A (codeforces 478A) 문제 풀이 및 코드 (description and code)
Problem - 478A - Codeforces
코드
import java.io.*;
public class CF478A {
static int c = 0;
static String ins[];
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
ins = br.readLine().split(" ");
for (int i = 0; i < 5; i++) c += Integer.parseInt(ins[i]);
bw.write((c % 5 == 0 && c != 0) ? c / 5 + "\n" : "-1\n");
bw.flush();bw.close();
}
}