n = int(input())
a = list(map(int, input().split()))
cnt = {}
for i in a:
    if i in cnt:
        cnt[i] += 1
    else:
        cnt[i] = 1
ans = 0
tarinai = []
amari = []
for i in range(1,n+1):
    if i in cnt and cnt[i]>0:
        cnt[i] -= 1
    else:
        tarinai.append(i)
for i in cnt:
    if cnt[i] > 0:
        for j in range(cnt[i]):
            amari.append(i)

amari.sort()
for i,j in zip(tarinai, amari):
    ans += abs(i-j)

print(ans)