n = int(input())
a = list(map(int, input().split()))

count = [0] * (n + 1)
for num in a:
    count[num] += 1

excess = []
for i in range(1, n + 1):
    if count[i] > 1:
        excess.extend([i] * (count[i] - 1))

missing = []
for i in range(1, n + 1):
    if count[i] == 0:
        missing.append(i)

excess.sort()
missing.sort()

total_cost = 0
for x, y in zip(excess, missing):
    total_cost += abs(x - y)

print(total_cost)