// yukicoder: No.693 square1001 and Permutation 2
// 2019.5.6 bal4u

#include <stdio.h>
#include <stdlib.h>

#if 1
#define gc() getchar_unlocked()
#else
#define gc() getchar()
#endif
int in()    // 非負整数の入力
{
	int n = 0, c = gc();
	do n = 10 * n + (c & 0xf), c = gc(); while (c >= '0');
	return n;
}

#define ABS(x)  ((x)>=0?(x):-(x))
int cmp(const void *a, const void *b) { return *(int *)a - *(int *)b; }
int a[53]; int N;

int main()
{
	int i, ans;
	N = in();
	for (i = 1; i <= N; i++) a[i] = in();
	qsort(a+1, N, sizeof(int), cmp);
	ans = 0; for (i = 1; i <= N; i++) ans += ABS(a[i] - i);
	printf("%d\n", ans);
	return 0;
}