#include <bits/stdc++.h>
using namespace std;
const int N = 1e9 + 7;
int ans = 0;
void dfs(int n,int a,int b,int c) {
	if (n < c) {
		++ans;
		ans %= N;
		return;
	}
	dfs(n - a,a,b,c);
	dfs(n - b,a,b,c);
	return;
}
int main() {
	int n,a,b,c;
	cin >> n >> a >> b >> c;
	dfs(n,a,b,c);
	cout << ans;
	return 0;
}