n = int(input())

a = [int(input()) for i in range(n+1)]
b = [int(input()) for i in range(n+1)]

s = [0]*(n+2)

for i in range(n+1):
    s[i+1] = s[i] + b[i]
    
s = s[::-1]

ans = 0
for i in range(n+1):
    ans += s[i]*a[i]
    
print(ans%(10**9+7))