import java.util.Scanner;
public class For_Test_2 {
  public static void main(String args[]) {
    int N; float avg = 0.0f, sum = 0.0f, score;
    Scanner scan = new Scanner(System.in);
    System.out.print("จำนวนนิสิต >>> ");
    N = scan.nextInt();
    for(int i=0;i<N;i++) {
      System.out.print("คะแนนสอบของนิสิตคนที่ " +
              (i+1) + " >>> ");
      score = scan.nextFloat();
      sum=sum+score;
    }
    avg=sum/N;
    System.out.println("คะแนนเฉลี่ย = "+avg);
  }
}