求改

n=int(input())
h=list(map(int,input().split()))
dp=[0]*n
def mian(n):
    global h,dp
    dp[1]=abs(h[1]-h[0])
    dp[2]=min(dp[1]+abs(h[2]-h[1]),h[2]-h[0])
    if n<3:
        return(dp[n])
    for i in range(3,n):
        dp[i]=min(dp[i-1]+abs(h[i]-h[i-1]),dp[i-2]+abs(h[i]-h[i-2]))
    return(dp[-1])
print(mian(n))