using System;
public class Program {
public static void Main() {
string[] s = Console.ReadLine().Split(" ");
int[] i = 字符串数组转整数数组(s);
if((i[2]%i[1]) !=0 )
{
if(i[0]>(i[2]/i[1]+1))
{
Console.WriteLine(i[0]-(i[2]/i[1]+1));
}
else
{
Console.WriteLine("0");
}
}
else
{
if(i[0]>(i[2]/i[1]))
{
Console.WriteLine(i[0]-(i[2]/i[1]));
}
else
{
Console.WriteLine("0");
}
}
}
public static int[] 字符串数组转整数数组(string[] arr)
{
int[] d = new int[arr.Length];
for(int i = 0;i < arr.Length;i++)
{
d[i] = int.Parse(arr[i]);
}
return d;
}
}