import sys

MOD = 10**9 + 7

def main():
    data = list(map(int, sys.stdin.read().split()))
    ptr = 0
    n = data[ptr]
    ptr += 1
    a = data[ptr:ptr + n + 1]
    ptr += n + 1
    b = data[ptr:ptr + n + 1]
    ptr += n + 1
    
    if n == 0:
        print((a[0] * b[0]) % MOD)
        return
    
    # Compute prefix sum of b
    s = [0] * (n + 1)
    s[0] = b[0] % MOD
    for i in range(1, n + 1):
        s[i] = (s[i - 1] + b[i]) % MOD
    
    total = 0
    for p in range(n + 1):
        k = n - p
        sum_b = s[k]
        total = (total + a[p] * sum_b) % MOD
    
    print(total % MOD)

if __name__ == '__main__':
    main()