```import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner in = new Scanner(System.in);
		int a = in.nextInt();
		int b = in.nextInt();
		int c = in.nextInt();
		int d = c%b;
		int e = 0;
		if(c>b){
			if(d==0){
			e=c/b;
			}else{
			e=c/b+1;
			}
		}else{
			e=1;
		}
		int s = a-e;
		System.out.println(s);
	}
}