import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class ScoreCalculator {
    public static void main(String[] args) {
        String fileName = "scores.txt";
        int sum = 0;
        int count = 0;
        try (BufferedReader br = new BufferedReader(new FileReader(fileName))) {
            String line;
            while ((line = br.readLine()) != null) {
                try {
                    int score = Integer.parseInt(line.trim());
                    sum += score;
                    count++;
                } catch (NumberFormatException e) {
                    System.err.println("警告：文件中包含无效数字，跳过该行：" + line);
                }
            }
            if (count > 0) {
                double average = (double) sum / count;
                System.out.println("平均分：" + average);
            } else {
                System.out.println("文件中没有有效成绩数据");
            }

        } catch (IOException e) {
            System.err.println("文件读取错误：" + e.getMessage());
        }
    }
}