using System;
using System.Linq;
using System.Collections.Generic;
using System.Diagnostics;
using Debug = System.Diagnostics.Trace;
using SB = System.Text.StringBuilder;
using static System.Math;
using Number = System.Int32;

namespace Program {
	public class Solver {
		Random rnd = new Random();
		public void Solve() {
			var n = ri;
			var G = Enumerate(n, x => new List<int>());
			var par = new int[n];
			for (int i = 0; i < n; i++) {
				var u = ri - 1;
				G[u].Add(i);
				par[i] = u;
			}
			var g = new int[n];
			for (int i = 0; i < n; i++) g[i] = -1;
			var cnt = Enumerate(n, x => G[x].Count);
			var q = new Queue<int>();
			for (int i = 0; i < n; i++) if (cnt[i] == 0) q.Enqueue(i);
			while (q.Any()) {
				var p = q.Dequeue();
				cnt[par[p]]--;
				if (cnt[par[p]] == 0)
					q.Enqueue(par[p]);
				var s = new HashSet<int>();
				foreach (var t in G[p])
					s.Add(g[t]);
				for (int i = 0; i <= n; i++)
					if (s.Add(i)) { g[p] = i; break; }
			}
			var r = Enumerate(n, x => x).Where(x => g[x] == -1).First();
			Debug.WriteLine(par.AsJoinedString());
			Debug.WriteLine(g.AsJoinedString());
			Debug.WriteLine(r);
			Debug.WriteLine("------");
			for (int x = 0; x * x <= n + 5; x++) {
				g[r] = x;
				for (var p = par[r]; ; p = par[p]) {
					var s = new SortedSet<int>();
					foreach (var t in G[p])
						s.Add(g[t]);
					for (int i = 0; i <= n + 5; i++)
						if (s.Add(i)) {
							g[p] = i; break;
						}
					if (p == r) break;
				}
				if (g[r] == x) {
					Debug.WriteLine(g.AsJoinedString());
					Console.WriteLine("POSSIBLE");
					return;
				}
			}
			Console.WriteLine("IMPOSSIBLE");
		}

		const long INF = 1L << 60;
		static int[] dx = { -1, 0, 1, 0 };
		static int[] dy = { 0, 1, 0, -1 };
		int ri { get { return sc.Integer(); } }
		long rl { get { return sc.Long(); } }
		double rd { get { return sc.Double(); } }
		string rs { get { return sc.Scan(); } }
		public IO.StreamScanner sc = new IO.StreamScanner(Console.OpenStandardInput());

		static T[] Enumerate<T>(int n, Func<int, T> f) {
			var a = new T[n];
			for (int i = 0; i < a.Length; ++i) a[i] = f(i);
			return a;
		}
		static public void Swap<T>(ref T a, ref T b) { var tmp = a; a = b; b = tmp; }
	}
}

#region main
static class Ex {
	static public string AsString(this IEnumerable<char> ie) { return new string(ie.ToArray()); }
	static public string AsJoinedString<T>(this IEnumerable<T> ie, string st = " ") {
		return string.Join(st, ie);
	}
	static public void Main() {
		Console.SetOut(new Program.IO.Printer(Console.OpenStandardOutput()) { AutoFlush = true });
		var solver = new Program.Solver();
		//* 
		var t = new System.Threading.Thread(solver.Solve, 50000000);
		t.Start();
		t.Join();
		//*/
		// solver.Solve();
		Console.Out.Flush();
	}
}
#endregion
#region Ex
namespace Program.IO {
	using System.IO;
	using System.Text;
	using System.Globalization;

	public class Printer : StreamWriter {
		public override IFormatProvider FormatProvider { get { return CultureInfo.InvariantCulture; } }
		public Printer(Stream stream) : base(stream, new UTF8Encoding(false, true)) { }
	}

	public class StreamScanner {
		public StreamScanner(Stream stream) { str = stream; }

		public readonly Stream str;
		private readonly byte[] buf = new byte[1024];
		private int len, ptr;
		public bool isEof = false;
		public bool IsEndOfStream { get { return isEof; } }

		private byte read() {
			if (isEof) return 0;
			if (ptr >= len) {
				ptr = 0;
				if ((len = str.Read(buf, 0, 1024)) <= 0) {
					isEof = true;
					return 0;
				}
			}
			return buf[ptr++];
		}

		public char Char() {
			byte b = 0;
			do b = read(); while ((b < 33 || 126 < b) && !isEof);
			return (char)b;
		}
		public string Scan() {
			var sb = new StringBuilder();
			for (var b = Char(); b >= 33 && b <= 126; b = (char)read()) sb.Append(b);
			return sb.ToString();
		}
		public string ScanLine() {
			var sb = new StringBuilder();
			for (var b = Char(); b != '\n' && b != 0; b = (char)read()) if (b != '\r') sb.Append(b);
			return sb.ToString();
		}
		public long Long() { return isEof ? long.MinValue : long.Parse(Scan()); }
		public int Integer() { return isEof ? int.MinValue : int.Parse(Scan()); }
		public double Double() { return isEof ? double.NaN : double.Parse(Scan(), CultureInfo.InvariantCulture); }
	}
}

#endregion


Measured memory_bytes: 41080