#include<iostream>
using namespace std;
int main(){
   int m,t,s;
   cin>>m>>t>>s;
   if(t!=0){
	   int a=ceil(1.0*s/t);
	   if(a<=m)
	   cout<<(m-a);
	   else
		   cout<<0;
   }
   else
	   cout<<0;
   system("pause");
   return 0;
}