#include <bits/stdc++.h>
using namespace std;

int main(){
    int N, i, cnt = 0, in;
    vector <int> num;

    cin >> N;
    while(cin >> in){
        num.push_back(in);
    }
    sort(num.begin(), num.end());

    for(i = 1; i < N + 1; i++){
        if(num[i - 1] > i){
            cnt += num[i - 1] - i;
        }else if(num[i - 1] < i){
            cnt += i - num[i - 1];
        }
    }

    cout << cnt << endl;

    return 0;
}