#include #include #include using namespace std; //#include //using namespace atcoder; using ll = long long; using vll = vector; using vvll = vector; using vvvll = vector; using vvvvll = vector; using vvvvvll = vector; using vvvvvvll = vector; using vb = vector; using vvb = vector; using vvvb = vector; using vvvvb = vector; using vd = vector; using vvd = vector; using vvvd = vector; using vvvvd = vector; using vvvvvd = vector; #define all(A) A.begin(),A.end() #define ALL(A) A.begin(),A.end() #define rep(i, n) for (ll i = 0; i < (ll) (n); i++) using pqr = priority_queue, vector>, greater>>; #define tN(t) (t==1?XN:YN) #define tS(t) (t==1?XS:YS) #define tA(t) (t==1?XA:YA) template bool chmax(T& p, T q, bool C = 1) { if (C == 0 && p == q) { return 1; } if (p < q) { p = q; return 1; } else { return 0; } } template bool chmin(T& p, T q, bool C = 1) { if (C == 0 && p == q) { return 1; } if (p > q) { p = q; return 1; } else { return 0; } } ll gcd(ll(a), ll(b)) { if (b == 0)return a; ll c = a; while (a % b != 0) { c = a % b; a = b; b = c; } return b; } ll sqrtz(ll N) { ll L = 0; ll R = sqrt(N)+10000; while (abs(R - L) > 1) { ll mid = (R +L) / 2; if (mid * mid <= N)L = mid; else R = mid; } return L; } vector fact, factinv, inv; ll mod = 998244353; void prenCkModp(ll n) { fact.resize(n + 5); factinv.resize(n + 5); inv.resize(n + 5); fact.at(0) = fact.at(1) = 1; factinv.at(0) = factinv.at(1) = 1; inv.at(1) = 1; for (ll i = 2; i < n + 5; i++) { fact.at(i) = (fact.at(i - 1) * i) % mod; inv.at(i) = mod - (inv.at(mod % i) * (mod / i)) % mod; factinv.at(i) = (factinv.at(i - 1) * inv.at(i)) % mod; } } ll nCk(ll n, ll k) { if (n < k) return 0; return fact.at(n) * (factinv.at(k) * factinv.at(n - k) % mod) % mod; } /* ll modPow(long long a, long long n, long long p) { if (n == 0) return 1; // 0乗にも対応する場合 if (n == 1) return a % p; if (n % 2 == 1) return (a * modPow(a, n - 1, p)) % p; long long t = modPow(a, n / 2, p); return (t * t) % p; }*/ ll modPow(ll a, ll n, ll p) { ll res = 1; ll k = a; while (n > 0) { if (n % 2 == 1) { res *= k; if (res > p)res %= p; } k = k * k; if (k > p)k %= p; n /= 2; } return res; } int main() { cin.tie(nullptr); ios::sync_with_stdio(false); ll N,M=1e9+7;; cin>>N; vll A(N+1),B(N+1); rep(i,N+1)cin>>A[i]; rep(i,N+1)cin>>B[i]; //rep(i,N)A[i+1]+=A[i]; rep(i,N)B[i+1]+=B[i]; ll an=0; rep(i,N+1){ an+=(A[i]%M)*(B[N-i]%M); an%=M;//21 14 22 } cout<