import sys
sys.setrecursionlimit(100000000)
input = sys.stdin.readline
MOD = 10 ** 9 + 7
INF = 10 ** 15

def main():
    N = int(input())
    A = list(map(int,input().split()))
    A.sort()
    ans = 0
    for i in range(N):
        ans += abs(A[i] - i - 1)
    print(ans)
if __name__ == '__main__':
    main()