#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: wngjinming
	Language: C++
	Result: Accepted
	Time:33 ms
	Memory:2072 kb
****************************************************************/