#include<algorithm>
#include<iostream>
#include<cstring>
#include<bitset>
#include<cstdio>
#include<string>
#include<cmath>
#include<queue>
#include<stack>
#include<map>
#include<set>
using namespace std;
#define neinf 0xc0c0c0c0c0c0c0c0ll
#define inf 0x3f3f3f3f3f3f3f3fll
#define uint unsigned int
#define ull unsigned ll
#define ll long long
#define reg register
#define db double
#define il inline
#define gc getchar
#define pc putchar
#define HgS 998244353
il ll rd()
{
	reg ll res=0,lab=1;
	reg char ch=gc();
	while((ch<'0'||ch>'9')&&ch!=EOF)
	{if(ch=='-')lab=-lab;ch=gc();}
	while(ch>='0'&&ch<='9')
		res=(res<<3)+(res<<1)+(ch&15),ch=gc();
	return res*lab;
}
il void prt(ll x,char t=' ')
{
	reg char ch[70];reg int tp=0;
	if(x<0)pc('-'),x=-x;
	while(x)ch[++tp]=(x%10)^48,x/=10;
	if(!tp)ch[++tp]=48;
	while(tp)pc(ch[tp--]);
	if(t)pc(t);
}
ll n,f[200005],v[200005],ans;
il void dfs(int cur)
{
	if(v[cur]==2)return;
	if(v[cur]==1){++ans;return;}
	++v[cur];dfs(f[cur]);++v[cur];
}
il ll qpow(ll n,ll e,ll p=HgS)
{
	reg ll res=1;
	while(e){if(e&1)res=res*n%p;n=n*n%p;e>>=1;}
	return res;
}
int main()
{
	n=rd();for(int i=1;i<=n;++i)f[i]=rd();
	for(int i=1;i<=n;++i)if(!v[i])dfs(i);
	prt(qpow(2,ans)-1);
	return 0;
}

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<string, string> pss;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<pii> vii;
typedef vector<ll> vl;
typedef vector<vl> vvl;

double EPS=1e-9;
int INF=1000000005;
long long INFF=1000000000000000005ll;
double PI=acos(-1);
int dirx[8]={ -1, 0, 0, 1, -1, -1, 1, 1 };
int diry[8]={ 0, 1, -1, 0, -1, 1, -1, 1 };
const ll MOD = 1000000007;

ll sum() { return 0; }
template<typename T, typename... Args>
T sum(T a, Args... args) { return a + sum(args...); }

#define DEBUG fprintf(stderr, "====TESTING====\n")
#define VALUE(x) cerr << "The value of " << #x << " is " << x << endl
#define OUT(x) cout << x << endl
#define OUTH(x) cout << x << " "
#define debug(...) fprintf(stderr, __VA_ARGS__)
#define READ(x) for(auto &(z):x) cin >> z;
#define FOR(a, b, c) for (int(a)=(b); (a) < (c); ++(a))
#define FORN(a, b, c) for (int(a)=(b); (a) <= (c); ++(a))
#define FORD(a, b, c) for (int(a)=(b); (a) >= (c); --(a))
#define FORSQ(a, b, c) for (int(a)=(b); (a) * (a) <= (c); ++(a))
#define FORC(a, b, c) for (char(a)=(b); (a) <= (c); ++(a))
#define EACH(a, b) for (auto&(a) : (b))
#define REP(i, n) FOR(i, 0, n)
#define REPN(i, n) FORN(i, 1, n)
#define MAX(a, b) a=max(a, b)
#define MIN(a, b) a=min(a, b)
#define SQR(x) ((ll)(x) * (x))
#define RESET(a, b) memset(a, b, sizeof(a))
#define fi first
#define se second
#define mp make_pair
#define pb push_back
#define ALL(v) v.begin(), v.end()
#define ALLA(arr, sz) arr, arr + sz
#define SIZE(v) (int)v.size()
#define SORT(v) sort(ALL(v))
#define REVERSE(v) reverse(ALL(v))
#define SORTA(arr, sz) sort(ALLA(arr, sz))
#define REVERSEA(arr, sz) reverse(ALLA(arr, sz))
#define PERMUTE next_permutation
#define TC(t) while (t--)
#define FAST_INP  ios_base::sync_with_stdio(false);cin.tie(NULL)
#define what_is(x) cerr << #x << " is " << x << endl;

void solve() {
	
}

int main()
{
    FAST_INP;
//    #ifndef ONLINE_JUDGE
//    freopen("input.txt","r", stdin);
//    freopen("output.txt","w", stdout);
//    #endif

//    int tc; cin >> tc;
//    TC(tc) solve();
	char s, n;
	cin >> s >> n;
	if(s=='Y') OUT((char)toupper(n));
	else OUT(n);
    return 0;
}