import sys

input = sys.stdin.buffer.readline
INF = 10 ** 18


class QueueAggregation:
    def __init__(self, e, f):
        self.e = e
        self.f = f
        self.front = []
        self.back = []

    def fold_all(self):
        return self.f(
            self.front[-1][0] if self.front else self.e,
            self.back[-1][0] if self.back else self.e,
        )

    def append(self, val):
        x = self.f(
            self.back[-1][0] if self.back else self.e,
            val,
        )
        self.back.append((x, val))

    def appendleft(self, val):
        x = self.f(
            val,
            self.front[-1][0] if self.front else self.e,
        )
        self.front.append((x, val))

    def pop(self):
        if not self.front:
            while self.back:
                _, val = self.back.pop()
                self.appendleft(val)
        return self.front.pop()[1]


def main():
    N = int(input())
    X = list(map(int, input().split()))
    A = list(map(int, input().split()))
    M = max(A) + 1
    DP = [[INF] * M for _ in range(3)]
    EP = [[INF] * M for _ in range(3)]
    for j in range(3):
        DP[j][A[0] * 2 - 2 >> 1] = 0
    for i in range(1, N):
        w = X[i] - X[i - 1]
        for j in range(3):
            for k in range(M):
                DP[j][k] += (k * 2 + 2 - j) * w
                EP[j][k] = INF
        for j in range(3):
            for nj in range(j, 3):
                que = QueueAggregation(INF, min)
                L, R = 0, 0
                for nk in range(M):
                    nL = max(nk - A[i], A[i] - nk - 2 + j, int(j == 2))
                    nR = min(M, nk + A[i] + 1 - nj + j)
                    while L > nL:
                        L -= 1
                        que.appendleft(DP[j][L])
                    while R < nR:
                        que.append(DP[j][R])
                        R += 1
                    while L < nL:
                        que.pop()
                        L += 1
                    EP[nj][nk] = min(EP[nj][nk], que.fold_all())
        DP, EP = EP, DP
    ANS = DP[2][0]
    if ANS >= INF:
        ANS = -1
    print(ANS)


if __name__ == "__main__":
    main()