[UNIEX] 6

import java.util.Scanner;

public class apples {

	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		int range = (40 - 20) + 1; // assuming that each class has 20 to 40 students

		int shihva1 = 0;
		int shihva2 = 0;
		int shihva3 = 0;
		int countinput = 1;
		while (countinput <= 12) {
			System.out.println("students in grade's 7 classes: ");
			while (countinput <= 4) {
				double r = (Math.random() * range) + 20;
				System.out.print((int) r + " ");
				shihva1 += r;
				countinput++;
			}
			System.out.println();
			System.out.println("students in grade's 8 classes: ");
			while (countinput <= 8 && countinput > 4) {
				double r = (Math.random() * range) + 20;
				System.out.print((int) r + " ");
				shihva2 += r;
				countinput++;
			}
			System.out.println();
			System.out.println("students in grade's 9 classes: ");
			while (countinput <= 12 && countinput > 8) {
				double r = (Math.random() * range) + 20;
				System.out.print((int) r + " ");
				shihva3 += r;
				countinput++;
			}
		}
		System.out.println();
		System.out.println("Sum for grade 7: " + shihva1
				+ "\nSum for grade 8: " + shihva2 + "\nSum for grade 9: "
				+ shihva3);
		System.out.println("Sum for school: " + (shihva1 + shihva2 + shihva3));
		in.close();
	}

}