#include <bits/stdc++.h>
using namespace std;
int main(){
	int m,t,s;
	scanf("%d%d%d",&m,&t,&s);
	if (t==0)
	  printf("%d",0);
	if (s/t>=m)
	  printf("%d",0);
	else
	  printf("%d",(m-(s/t)));
	return 0;
}