n = int(eval(input()))

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

dp = [0] * n

dp[0] = 0

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]))
import sys



sys.setrecursionlimit(10 ** 7)

f_inf = float('inf')

mod = 10 ** 9 + 7





def resolve():

    n = int(eval(input()))

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



    dp = [f_inf for _ in range(n)]

    dp[0] = 0

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

    for i in range(2, n):

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



    print((dp[-1]))





if __name__ == '__main__':

    resolve()

n = int(eval(input()))
h = list(map(int, input().split()))
dp = [0] * n
dp[0] = 0
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]))

import sys

sys.setrecursionlimit(10**7)
f_inf = float("inf")
mod = 10**9 + 7


def resolve():
    n = int(eval(input()))
    H = list(map(int, input().split()))
    dp = [f_inf for _ in range(n)]
    dp[0] = 0
    dp[1] = abs(H[1] - H[0])
    for i in range(2, n):
        dp[i] = min(
            dp[i], dp[i - 1] + abs(H[i] - H[i - 1]), dp[i - 2] + abs(H[i] - H[i - 2])
        )
    print((dp[-1]))


if __name__ == "__main__":
    resolve()

-n = int(eval(input())) -h = list(map(int, input().split())) -dp = [0] * n -dp[0] = 0 -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])) +import sys + +sys.setrecursionlimit(10**7) +f_inf = float("inf") +mod = 10**9 + 7 + + +def resolve(): +    n = int(eval(input())) +    H = list(map(int, input().split())) +    dp = [f_inf for _ in range(n)] +    dp[0] = 0 +    dp[1] = abs(H[1] - H[0]) +    for i in range(2, n): +        dp[i] = min( +            dp[i], dp[i - 1] + abs(H[i] - H[i - 1]), dp[i - 2] + abs(H[i] - H[i - 2]) +        ) +    print((dp[-1])) + + +if __name__ == "__main__": +    resolve()