let n = Int(readLine()!)!
var (a,b) = ([Int](),[Int]())
for _ in 0...n{a += [Int(readLine()!)!]}
for _ in 0...n{b += [Int(readLine()!)!]}
var (am,bm) = (0,0)
for i in 0...n{
    bm += b[i]
    am += a[n - i] * bm
    am %= 1000000007
    bm %= 1000000007
}
print(am % 1000000007)