#include <cstdio>
#include <cstdlib>
#include <algorithm>
#include <vector>
#include <numeric>

int main() {
  size_t N;
  scanf("%zu", &N);

  std::vector<int> A(N), B(N);
  for (auto& a_i: A) scanf("%d", &a_i);
  std::sort(A.begin(), A.end());
  std::iota(B.begin(), B.end(), 1);

  int res = 0;
  for (size_t i = 0; i < N; ++i)
    res += abs(A[i]-B[i]);

  printf("%d\n", res);
}