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]))



n = int(eval(input()))

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

dp = [0]*(n+1)

dp[0] = 0

for i in range(1, n):

    if i == 1:

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

    else:

        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]))
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]))

n = int(eval(input()))
h = list(map(int, input().split()))
dp = [0] * (n + 1)
dp[0] = 0
for i in range(1, n):
    if i == 1:
        dp[i] = dp[i - 1] + abs(h[i] - h[i - 1])
    else:
        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]))

-dp = [0] * n +dp = [0] * (n + 1) -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])) +for i in range(1, n): +    if i == 1: +        dp[i] = dp[i - 1] + abs(h[i] - h[i - 1]) +    else: +        dp[i] = min(dp[i - 1] + abs(h[i] - h[i - 1]), dp[i - 2] + abs(h[i] - h[i - 2]))