N=int(input())
A=list(map(int,input().split()))

X=set(range(1,N+1))
Y=[]
for a in A:
    if a in X:
        X.remove(a)
    else:
        Y.append(a)

X=sorted(list(X))
Y.sort()

K=0
for i in range(len(X)):
    K+=abs(X[i]-Y[i])

print(K)