#include <iostream>
using namespace std;

int main2()
{
    long long N, i;
    cin >> N;
    long long N2 = N / 2;
    long long a[100001];
    long long b[100001];
    long long ans = 0;
    b[0] = 1;
    for (i = 1; i < N2+1; ++i) {
        b[i] = b[i-1]*(N-i)/i;
        cout << i << " " << b[i] << endl;
    }
    for (i = 0; i < N; ++i) {
        cin >> a[i];
    }
    for (i = 0; i < N2; ++i) {
        ans += (a[i]+a[N-1-i])*b[i];
        ans %= 1000000007;
    }
    if (N%2 == 1) {
        ans += a[N2]*b[N2];
    }
    cout << ans % 1000000007 << endl;
    return 0;
}

int main()
{
    int N, i, j;
    cin >> N;
    int a[100001];
    for (i = 0; i < N; ++i) {
        cin >> a[i];
    }
    for (i = N-1; i >= 1; --i) {
        for (j = 0; j < i ; ++j) {
            a[j] += a[j+1];
            a[j] %= 1000000007;
        }
    }
    cout << a[0] % 1000000007 << endl;
}