题解 | #KiKi和酸奶#

import java.util.Scanner;
public class Main{
    public static void  main(String[] args){
        Scanner in = new Scanner(System.in);
        String input = in.nextLine();
        String []list=input.split(" ");
        int []num=new int[list.length];
        for(int i=0;i<list.length;i++)
        {
            num[i]=Integer.parseInt(list[i]);
        }
       System.out.print(Surplus(num[0],num[1],num[2]));
    }
    public static int  Surplus(int a,int b,int c) {
        return(a-(c%b==0? c/b:(c/b)+1));
    }
}