import java.util.Scanner;

public class p06TwoNumsSum {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int from = Integer.parseInt(scan.nextLine());
        int to = Integer.parseInt(scan.nextLine());
        int magic = Integer.parseInt(scan.nextLine());
        int counter = 0;
        boolean isMagic = false;

        for (int i = from; i >= to; i--) {
            for (int j = from; j >= to; j--) {
                counter++;
                if (i + j == magic && !isMagic) {
                    isMagic = true;
                    System.out.printf("Combination N:%d (%d + %d = %d)",counter,i,j,magic);
                }
            }
        }
        if (!isMagic) {
            System.out.printf("%d combinations - neither equals %d", counter,magic);
        }
    }
}