N = int(eval(input()))

h = [int(i) for i in input().split()]



dp=[0 for i in range(N)]

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



for i in range(N-2):

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

print((dp[N-1]))

N = int(eval(input()))

h = [int(i) for i in input().split()]



dp = [0]*N

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



for i in range(N-2):

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

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

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

-dp = [0 for i in range(N)] +dp = [0] * N