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

/**************************************************************
	Problem: 1016
	User: zzz
	Language: C++
	Result: Accepted
	Time:15 ms
	Memory:2072 kb
****************************************************************/