#include<bits/stdc++.h>
using namespace std;
int main(){
	int  n,x,y,s;
    cin>>n>>x>>y;
	s=y/x;
	if(y%x==0){
		cout<<n-s;
	}
	if(y%x!=0)
		cout<<n-s-1;	
	return 0;
}