n = int(input())
a = sorted(list(map(int, input().split())))
b, c = [], []
d = set(a)
ans = 0
nums = [i for i in range(1, 51) if not i in d]

for i in a:
  if i in b:
    c.append(i)
  else:
    b.append(i)

for i in range(len(c)):
  ans += abs(nums[i] - c[i])

print(ans)