import java.util.Scanner;

public class NilaiApp {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int jumlahData = 0;
        boolean lanjut = true;

        while (lanjut) {
            System.out.print("Nilai: ");
            double nilai = in.nextDouble();

            if (nilai < 0 || nilai > 100) {
                System.out.println("Nilai harus 0-100");
            } else {
                String grade;
                if (nilai >= 80) {
                    grade = "A";
                } else if (nilai >= 70) {
                    grade = "B";
                } else if (nilai >= 60) {
                    grade = "C";
                } else {
                    grade = "D/E";
                }
                System.out.println("Grade = " + grade);
                jumlahData++;
            }

            System.out.print("Ulangi lagi? (y/n): ");
            String jawaban = in.next();
            if (jawaban.equalsIgnoreCase("n")) {
                lanjut = false;
            }
        }
        System.out.println("Total data yang diproses: " + jumlahData);
    }
}