n = int(input())
a = list(map(int,input().split()))
ans = 0
a.sort()
ans += a[1]-a[0]
a[0] = a[1]
for i in range(1,n-1):
  if a[i] == a[i-1]:
    continue
  if a[i] - a[i-1] < a[i+1] - a[i]:
    ans += a[i] - a[i-1]
    a[i] = a[i-1]
  else:
    ans += a[i+1] - a[i]
    a[i] = a[i+1]

ans += a[n-1]-a[n-2]
print(ans)