N = int(eval(input()))

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

dp = [0] * N

for i in range(1, N):

    if i == 1:

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

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