import std.stdio, std.array, std.string, std.conv, std.algorithm;
import std.typecons, std.range, std.random, std.math, std.container;
import std.numeric, std.bigint, core.bitop, core.stdc.stdlib;

void main() {
    auto N = readln.chomp.to!int;
    auto A = readln.split.map!(to!long).array;

    immutable long mod = 10^^9 + 7;

    foreach_reverse (i; 0..N) {
        foreach (j; 0..i) {
            A[j] = (A[j] + A[j+1]) % mod;
        }
    }

    A.front.writeln;
}