#include "bits/stdc++.h"
using namespace std;

// Inserted snippets: io, root
#define rep(i, a, b) for(int i = a; i < (b); ++i)
#define all(x) begin(x), end(x)
#define sz(x) (int)(x).size()
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
template<typename H> bool chmin(H& v1, const H v2) { if (v1 > v2) { v1 = v2; return true; } return false; }
template<typename H> bool chmax(H& v1, const H v2) { if (v1 < v2) { v1 = v2; return true; } return false; }
template<typename H> void read(H& head) { cin >> head; }
template<typename H, typename ...T> void read(H& head, T& ...tail) { cin >> head; read(tail...); }
template<typename H> void write(H head) { cout << head << '\n'; }
template<typename H, typename ...T> void write(H head, T ...tail) { cout << head << " "; write(tail...); }
template<typename ...T> void die(T ...tok) { write(tok...); exit(0); }
// End snippets

int main() {
	cin.tie(0)->sync_with_stdio(0);
	cin.exceptions(cin.failbit);

	int n; read(n);
	vector<ll> v(n);
	rep(i, 0, n) cin >> v[i];
	while (v.size() > 1) {
		vector<ll> w(sz(v) - 1);
		rep(i, 0, sz(w))
			w[i] = (v[i] + v[i + 1]) % 1000000007;
		v = w;
	}
	cout << v[0] << endl;
}