# No.693 square1001 and Permutation 2
n = int(input())
a = [int(s) for s in input().split()]
b = list(range(1, n + 1))
cost = 0

for i in range(n):
    if a[i] in b:
        b[b.index(a[i])] = 0
        a[i] = 0

a_dash = [i for i in a if i != 0]
b_dash = [i for i in b if i != 0]

for i in range(len(a_dash)):
    cost += abs(a_dash[i] - b_dash[i])

print(cost)