def main():

    n = int(eval(input()))

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

    dp = [0] * n

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

    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()
def main():

    n = int(eval(input()))

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

    dp = [0] * n

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



    for i1 in range(2, n):

        dp[i1] = min(dp[i1-2]+abs(h[i1]-h[i1-2]),dp[i1-1]+abs(h[i1]-h[i1-1]))

    print((dp[n - 1]))



if __name__ == '__main__':

    main()

def main():
    n = int(eval(input()))
    h = list(map(int, input().split()))
    dp = [0] * n
    dp[1] = abs(h[0] - h[1])
    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()

def main():
    n = int(eval(input()))
    h = tuple(map(int, input().split()))
    dp = [0] * n
    dp[1] = abs(h[0] - h[1])
    for i1 in range(2, n):
        dp[i1] = min(
            dp[i1 - 2] + abs(h[i1] - h[i1 - 2]), dp[i1 - 1] + abs(h[i1] - h[i1 - 1])
        )
    print((dp[n - 1]))


if __name__ == "__main__":
    main()

-    h = list(map(int, input().split())) +    h = tuple(map(int, input().split())) -    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])) +    for i1 in range(2, n): +        dp[i1] = min( +            dp[i1 - 2] + abs(h[i1] - h[i1 - 2]), dp[i1 - 1] + abs(h[i1] - h[i1 - 1]) +        )