n=int(eval(input()))

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



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

dp[0]=0

for i in range(n-1):

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

      if i<n-2:

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

print((dp[-1]))

n=int(eval(input()))

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



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

dp[0]=0

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

n = int(eval(input()))
h = list(map(int, input().split()))
dp = [float("inf")] * n
dp[0] = 0
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[-1]))

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