n = int(eval(input()))

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

 

a = [0 for _ in range(n)]

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

 

for i in range(2,n):

    a[i] = min(a[i-1]+abs(h[i]-h[i-1]), a[i-2]+abs(h[i]-h[i-2]))

    

print((a[-1]))
n = int(eval(input()))

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

inf = float("inf")

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

n = int(eval(input()))
h = list(map(int, input().split()))
inf = float("inf")
dp = [inf for i in range(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[-1]))

-a = [0 for _ in range(n)] -a[1] = abs(h[1] - h[0]) +inf = float("inf") +dp = [inf for i in range(n)] +dp[0] = 0 +dp[1] = abs(h[1] - h[0]) -    a[i] = min(a[i - 1] + abs(h[i] - h[i - 1]), a[i - 2] + abs(h[i] - h[i - 2])) -print((a[-1])) +    dp[i] = min(dp[i - 1] + abs(h[i] - h[i - 1]), dp[i - 2] + abs(h[i] - h[i - 2])) +print((dp[-1]))