import java.util.*;
public class Roman {
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		int p = sc.nextInt();
		int d = sc.nextInt();
		int z = sc.nextInt();
		int dan = 0;
		while (p > 0 && d > 0) {
			System.out.println(++dan + ": " + p + " -> " + (p-d > 0 ? p-d : 0));
			p -= d;
			d -= z;
		}
	}
}