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

enum mod = 10L^^9 + 7;

void main() {
    int n;
    scan(n);

    auto a = iota(n + 1).map!(i => readln.chomp.to!long).array;
    auto b = iota(n + 1).map!(i => readln.chomp.to!long).array;

    auto bs = new long[](n + 2);

    foreach (i ; 1 .. n + 2) {
        bs[i] = bs[i-1] + b[i-1];
        bs[i] %= mod;
    }

    long ans;

    foreach (i ; 0 .. n + 1) {
        ans += a[i] * bs[n + 1 - i];
        ans %= mod;
    }

    writeln(ans);
}













void scan(T...)(ref T args) {
    import std.stdio : readln;
    import std.algorithm : splitter;
    import std.conv : to;
    import std.range.primitives;

    auto line = readln().splitter();
    foreach (ref arg; args) {
        arg = line.front.to!(typeof(arg));
        line.popFront();
    }
    assert(line.empty);
}


void fillAll(R, T)(ref R arr, T value) {
    static if (is(typeof(arr[] = value))) {
        arr[] = value;
    }
    else {
        foreach (ref e; arr) {
            fillAll(e, value);
        }
    }
}