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

#include<bits/stdc++.h>
using namespace std;
int main()
{
    double a,b,c;
    cin>>a>>b>>c;
    a-=c/b;
    cout<<int(a);
}

C++ :

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