#include <bits/stdc++.h>
using namespace std;
int n, a[300005];
long long ans;
int main() {
  scanf("%d", &n);
  for (int i = 1; i <= n; ++i) scanf("%d", &a[i]);
  sort(a + 1, a + n + 1);
  for (int i = 1; i <= n; ++i) ans += (long long)abs(a[i] - i);
  cout << ans;
  return 0;
}
