def median(array):
    L = len(array)
    m=array[L//2]
    res=0
    for a in array:
        res+=abs(a-m)
    return res

N=int(input())
Y=list(map(int, input().split()))
Y.sort()
INF=10**18
dp=[INF]*(N+1)
dp[0]=0
for i in range(N-1):
    dp[i+2]=min(dp[i+2],dp[i]+median(Y[i:i+2]))
    if i+3<=N:
        dp[i+3]=min(dp[i+3],dp[i]+median(Y[i:i+3]))
print(dp[-1])