#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i,m,n) for(int i=m; i<n; ++i)
#define repl(i,m,n) for(ll i=m; i<n; ++i)

int main(){
    int N;
    cin >> N;

    vector<int> A(N);
    for(int &a : A) cin >> a;

    sort(A.begin(), A.end());

    int ans = 0;
    rep(i, 0, N){
        ans += abs(A[i] - (i+1));
    }
    cout << ans << endl;

    return 0;
}