N=int(input())
line=input()
line=line.rstrip().split(" ")
list1=[]
for i in range(N):
    list1.append(int(line[i]))
list1.sort()
list2=[]
for j in range(N):
    list2.append(j+1)
count=0
for k in range(N):
    count=count+abs(list1[k]-list2[k])
print(count)