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

public class ScoreAverage {
    public static void main(String[] args) {
        BufferedReader br = new BufferedReader(new FileReader("scores.txt"));
        String line;
        int sum = 0;
        int count = 0;
        while ((line = br.readLine()) != null) {
            sum += Integer.parseInt(line);
            count++;
        }
        br.close();
        double avg = (double) sum / count;
        System.out.println("平均分：" + avg);
    }
}