#include<iostream>
using namespace std;
int main()
{
	int a,b,c;
	cin>>a>>b>>c;
	if(b==0)
	{
		cout<<0;
		return 0;
	}
	b=c/b;
	if(b>a)
		cout<<0;
	else
		cout<<a-b;
	return 0;
}