KiKi和酸奶

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNext()) {
            int n = sc.nextInt(), h = sc.nextInt(), m = sc.nextInt();
            System.out.println(n - (m + h - 1) / h);
        }
    }
}