import std.stdio, std.conv, std.string, std.bigint;
import std.math, std.random, std.datetime;
import std.array, std.range, std.algorithm, std.container;
string read(){ static string[] ss; while(!ss.length) ss = readln.chomp.split; string res = ss[0]; ss.popFront; return res; }

const long mod = 1_000_000_007;

void main(){
	int n = read.to!int;
	long[] as, bs;
	foreach(i; 0 .. n + 1) as ~= read.to!long;
	foreach(i; 0 .. n + 1) bs ~= read.to!long;
	
	long ans = 0;
	long sum = 0;
	foreach(i; 0 .. n + 1){
		sum += as[i];
		sum %= mod;
		ans += sum * bs[n - i];
		ans %= mod;
	}
	ans.writeln;
}