N = gets.to_i
A = gets.split.map(&:to_i).sort

arr = [0]*N
A.each do |a|
    arr[a-1] += 1
end

ans = 0
rem = 0
N.times do |i|
    if arr[i] > 1
        rem += arr[i]-1
    else
        rem -= 1-arr[i]
    end
    ans += rem.abs
end

p ans