#include<iostream>
#define ll long long
const ll mod=1e9+7;
ll n,a,b,c;
ll dfs(ll cur){
	if(cur<=c)return 1;
	ll ans=dfs(cur-a)%mod+dfs(cur-b)%mod;
	return ans;
}
int main(){
	std::cin>>n>>a>>b>>c;
	std::cout<<dfs(n);
}

爆搜都有60pts