if __name__ == "__main__":

    N = int(eval(input()))

    h = list(map(int, input().split()))



    dp = [0] * N

    dp[1] = abs(h[1] - h[0])



    for i in range(2, N):

        dp[i] = min(dp[i-1] + abs(h[i] - h[i-1]), dp[i-2] + abs(h[i] - h[i-2]))



    print((dp[N-1]))

def main():

    N = int(eval(input()))

    h = list(map(int, input().split()))



    dp = [0] * (N+5)

    dp[1] = abs(h[1]-h[0])



    for i in range(2, N):

        dp[i] = min(dp[i-1] + abs(h[i]-h[i-1]), dp[i-2]+abs(h[i]-h[i-2]))



    print((dp[N-1]))





if __name__ == "__main__":

    main()

if __name__ == "__main__":
    N = int(eval(input()))
    h = list(map(int, input().split()))
    dp = [0] * N
    dp[1] = abs(h[1] - h[0])
    for i in range(2, N):
        dp[i] = min(dp[i - 1] + abs(h[i] - h[i - 1]), dp[i - 2] + abs(h[i] - h[i - 2]))
    print((dp[N - 1]))

def main():
    N = int(eval(input()))
    h = list(map(int, input().split()))
    dp = [0] * (N + 5)
    dp[1] = abs(h[1] - h[0])
    for i in range(2, N):
        dp[i] = min(dp[i - 1] + abs(h[i] - h[i - 1]), dp[i - 2] + abs(h[i] - h[i - 2]))
    print((dp[N - 1]))


if __name__ == "__main__":
    main()

-if __name__ == "__main__": +def main(): -    dp = [0] * N +    dp = [0] * (N + 5) + + +if __name__ == "__main__": +    main()