import java.util.Scanner;

public class GradeCalculator {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.println("Student Grade Calculator");
        System.out.print("Enter the number of students: ");
        int numStudents = scanner.nextInt();

        double totalScore = 0;

        for (int i = 1; i <= numStudents; i++) {
            System.out.print("Enter the score for Student " + i + ": ");
            double score = scanner.nextDouble();
            totalScore += score;
        }

        double averageScore = totalScore / numStudents;

        System.out.println("Average Score: " + averageScore);

        if (averageScore >= 90) {
            System.out.println("Grade: A");
        } else if (averageScore >= 80) {
            System.out.println("Grade: B");
        } else if (averageScore >= 70) {
            System.out.println("Grade: C");
        } else if (averageScore >= 60) {
            System.out.println("Grade: D");
        } else {
            System.out.println("Grade: F");
        }
    }
}