n = int(eval(input()))

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

dp = [0]*(n)

for i in range(1,n):

    if i>1:

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

    else:

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

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

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



dp = [0]*n

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



for i in range(2,n):

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

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

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

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