#include <iostream>
#include <cstdlib>

#define ASDF (1000000007)

int main()
{
    int n;
    std::cin >> n;
    long conv = 1;
    long sum = 0;
    for(int i = 1; i <= n; i++){
        long a;
        std::cin >> a;
        sum = (sum + a * conv) % ASDF;
        conv  = (conv * (n - i) / i) % ASDF;
    }
    std::cout << sum << std::endl;
}