#include<stdio.h>
int main()
{
	int m,t,s,ans;
	scanf("%d %d %d",&m,&t,&s);
	if (t==0 || s/t>=m)
	{
		ans=0;
	}else
	{
	double eat=s/t;
	if(eat-(int)eat>0){
		eat=(int)eat+1;
	}else
	{
		eat=(int)eat;
	}
	ans=m-eat;
	}
	printf("%d",ans);
	return 0;
}