// yukicoder: No.100 直列あみだくじ
// 2019.8.7 bal4u

#include <stdio.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); while ((c = gc()) >= '0');
	return n;
}

int N;
int a[55], t[55];
char f[55];
	
int main()
{
	int i, j, w, ans;

	N = in();
	for (i = 1; i <= N; i++) a[i] = in();
	for (i = 1; i <= N; i++) if (!f[i]) {
		j = i, w = 0;
		while (!f[j]) f[j] = 1, j = a[j], w++;
		t[w]++;
	}
//	for (i = 1; i <= N; i++) printf("%d ", t[i]); printf("\n");
	
	ans = 1;
	for (i = 2; i <= N; i+=2) if (t[i] & 1) { ans = 0; break; }
	puts(ans? "Yes": "No");
	return 0;
}