#include <bits/stdc++.h>
using namespace std;
int main(){
	int i,o,p,sum=0;
	cin>>i>>o>>p;
	for(int k=1;k<=i/o;k++){
		for(int y=1;y<=i/p;y++){
			if(k*o+y*p==i)sum++;
		}
	}
	cout<<sum;
}

/**************************************************************
	Problem: 1016
	User: zhouhongyi
	Language: C++
	Result: Accepted
	Time:20 ms
	Memory:2072 kb
****************************************************************/