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