N = int(eval(input()))

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

dp = [0]*N

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]))
def main():

    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]))

    

if __name__  == '__main__':

    main()
N = int(eval(input()))
h = list(map(int, input().split()))
dp = [0] * N
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]))

def main():
    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]))


if __name__ == "__main__":
    main()

-N = int(eval(input())) -h = list(map(int, input().split())) -dp = [0] * N -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])) +def main(): +    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])) + + +if __name__ == "__main__": +    main()