n = int(input())
l = [int(_) for _ in input().split()]
l = sorted(l)

nl = [i+1 for i in range(n)]

ans = 0
for i in range(n):
    if nl[i] - l[i] > 0:
        ans += nl[i] - l[i]
    else:
        ans -= nl[i] - l[i]

print(ans)