import java.util.Scanner;
//=================================================================================================
public class Assert {
//-------------------------------------------------------------------------------------------------
    private static final Scanner keyboard = new Scanner(System.in);
    private static final int MAX_MARKS = 10;
//-------------------------------------------------------------------------------------------------
    public static void main(String[] args) {

        boolean finished = false;
        int numberOfMarks = 0;
        int[][] marks = new int[2][MAX_MARKS];
        float percentage;

        System.out.println("Enter mark and maximal mark pairs, 0 0 to end.");
        do {
            marks[0][numberOfMarks] = keyboard.nextInt();
            marks[1][numberOfMarks] = keyboard.nextInt();
            if (marks[0][numberOfMarks] == 0 && marks[1][numberOfMarks] == 0) {
                finished= true;
            } else if (marks[0][numberOfMarks] >= 0 &&
marks[0][numberOfMarks] <= marks[1][numberOfMarks]) {
                numberOfMarks++;
            } else {
                System.out.println("Invalid pair");
            }
        } while (!finished && numberOfMarks < MAX_MARKS);

//----computePercentage was subcontracted
        percentage = computePercentage(marks,numberOfMarks);
        assert (percentage >= 0.0 && percentage <= 100.0) : percentage;

        System.out.printf("The overall percentage is %5.1f%%\n",percentage);
    }
//-------------------------------------------------------------------------------------------------
    private static float computePercentage(int[][] marks,int numberOfMarks) {

        byte total = 0;
        byte maximal = 0;
        int index;

        for (index = 0; index < numberOfMarks; index++) {
            total += marks[0][index];
            maximal += marks[1][index];
        }
        return((100.0f * total)/maximal);
    }
//-------------------------------------------------------------------------------------------------
}
//=================================================================================================