백준 #2869번 달팽이는 올라가고 싶다

import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		
		Scanner sc = new Scanner(System.in);
		
		int a = sc.nextInt();
		int b = sc.nextInt();
		int v = sc.nextInt();
		
		int day = (v - b) / (a - b);
		
		if((v - b) % (a - b) != 0) {
			day++;
		}
		System.out.println(day);
		sc.close();
	}
}