N = int(eval(input()))

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

INF = 10**9

dp = [INF]*N

dp[0] = 0

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

for i in range(2,N):

    dp1 = abs(h[i]-h[i-1])+dp[i-1]

    dp2 = abs(h[i]-h[i-2])+dp[i-2]

    dp[i] = min([dp1,dp2])

print((dp[N-1]))
def main():

    INF = 10**9

    N = int(eval(input()))

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

    dp = [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[N-1]))



if __name__ == '__main__':

    main()
N = int(eval(input()))
h = list(map(int, input().split()))
INF = 10**9
dp = [INF] * N
dp[0] = 0
dp[1] = abs(h[0] - h[1])
for i in range(2, N):
    dp1 = abs(h[i] - h[i - 1]) + dp[i - 1]
    dp2 = abs(h[i] - h[i - 2]) + dp[i - 2]
    dp[i] = min([dp1, dp2])
print((dp[N - 1]))

def main():
    INF = 10**9
    N = int(eval(input()))
    h = list(map(int, input().split()))
    dp = [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[N - 1]))


if __name__ == "__main__":
    main()

-N = int(eval(input())) -h = list(map(int, input().split())) -INF = 10**9 -dp = [INF] * N -dp[0] = 0 -dp[1] = abs(h[0] - h[1]) -for i in range(2, N): -    dp1 = abs(h[i] - h[i - 1]) + dp[i - 1] -    dp2 = abs(h[i] - h[i - 2]) + dp[i - 2] -    dp[i] = min([dp1, dp2]) -print((dp[N - 1])) +def main(): +    INF = 10**9 +    N = int(eval(input())) +    h = list(map(int, input().split())) +    dp = [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[N - 1])) + + +if __name__ == "__main__": +    main()