C++ :

#include <iostream>
using namespace std;
 
int main() {
int x,y,n,i,j;
	cin>>n>>x>>y; 
	j=y%x;		
	if(j!=0) j=y/x+1; 
	else  j=y/x;
	if(j>n)			
	cout<<"0";	
	else
	{
		i=n-j;	
		cout<<i;
}
return 0;}