n = int(eval(input()))

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



dp = [float('inf')] * n



dp[0] = 0

for i in range(1, n):

  if i == 1:

    dp[i] = dp[0] + 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[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 = [float("inf")] * n
dp[0] = 0
for i in range(1, n):
    if i == 1:
        dp[i] = dp[0] + 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[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]))

-dp = [float("inf")] * n -dp[0] = 0 -for i in range(1, n): -    if i == 1: -        dp[i] = dp[0] + 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])) +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]))