#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;
}
/**************************************************************
	Problem: 1016
	User: zhengzihao
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2072 kb
****************************************************************/