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

typedef long long ll;
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<long long> VL;
typedef vector<vector<long long>> VVL;
typedef pair<int,int> Pair;
typedef tuple<int,int,int> tpl;

#define ALL(a)  (a).begin(),(a).end()
#define SORT(c) sort((c).begin(),(c).end())
#define REVERSE(c) reverse((c).begin(),(c).end())
#define EXIST(m,v) (m).find((v)) != (m).end()
#define LB(a,x) lower_bound((a).begin(), (a).end(), x) - (a).begin()
#define UB(a,x) upper_bound((a).begin(), (a).end(), x) - (a).begin()

#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)  FOR(i,0,n)
#define RFOR(i,a,b) for(int i=(a)-1;i>=(b);--i)
#define RREP(i,n) RFOR(i,n,0)

#define en "\n"

constexpr double EPS = 1e-9;
constexpr double PI  = 3.1415926535897932;
constexpr int INF = 2147483647;
constexpr long long LINF = 1LL<<60;
constexpr long long MOD = 998244353;

template<class T> inline bool chmax(T& a, T b){if(a<b){a=b;return true;}return false;}
template<class T> inline bool chmin(T& a, T b){if(a>b){a=b;return true;}return false;}

struct modint {
    long long x;
    modint(long long x=0):x((x%MOD+MOD)%MOD){}
    long long val(){
        return x;
    }
    modint operator-() const { return modint(-x);}
    modint& operator+=(const modint a) {
        if ((x += a.x) >= MOD) x -= MOD;
        return *this;
    }
    modint& operator-=(const modint a) {
        if ((x += MOD-a.x) >= MOD) x -= MOD;
    	return *this;
    }
    modint& operator*=(const modint a) {
    	(x *= a.x) %= MOD;
        return *this;
    }
    modint operator+(const modint a) const {
        modint res(*this);
        return res+=a;
    }
    modint operator-(const modint a) const {
        modint res(*this);
        return res-=a;
    }
    modint operator*(const modint a) const {
        modint res(*this);
        return res*=a;
    }
    modint pow(long long t) const {
        if (!t) return 1;
        modint a = pow(t>>1);
        a *= a;
    	if (t&1) a *= *this;
        return a;
    }

	// must be gcd(x,MOD)==1
    modint inv() const {
		// a^{-1} = 1/a MOD p (拡張Euclidの互除法)
		long long b = MOD, u = 1, v = 0, z = x;
		while(b){
			long long t = z / b;
			z -= t * b; swap(z, b);
			u -= t * v; swap(u, v);
		}
		u %= MOD;
		if (u < 0) u += MOD;
		return modint(u);
	}

    //modint inv() const {
    //    return pow(MOD-2);
    //}

    modint& operator/=(const modint a) {
    	return (*this) *= a.inv();
    }
    modint operator/(const modint a) const {
        modint res(*this);
        return res/=a;
    }
};
using mint = modint;

struct Factorial{

    vector<mint> fact, ifact;

    Factorial(int N): fact(N+1), ifact(N+1) {
        assert(N < MOD);

        fact[0] = 1;
        for(int i=0; i<N; i++) fact[i+1] = fact[i] * (i+1);

        ifact[N] = fact[N].inv();
        for(int i=N; i>0; i--) ifact[i-1] = ifact[i] * i;
    }

    mint C(int n, int k){
        if (k < 0 || k > n) return 0;
        return fact[n]*ifact[k]*ifact[n-k];
    }

    mint P(int n, int k){
        if (k < 0 || k > n) return 0;
        return fact[n]*ifact[n-k];
    }

    mint inv(int n){
        assert(n>0);
        return fact[n-1]*ifact[n];
    }
};

Factorial F(10000);
vector<int> bi(15);

void Main(){
    int N,M; cin >> N >> M;
    bi[0] = 1; REP(i,15) bi[i+1] = bi[i]*2;
    mint dp[13][M+1];
    for(int i=0; i<=M; i+=2){
        dp[0][i] = F.C(N,i);
    }

    REP(i,12)REP(j,M+1){
        for(int k=0; k<=M-j; k+=2){
            if(j+k*bi[i+1] > M) break;
            dp[i+1][j+k*bi[i+1]] += dp[i][j] * F.C(N,k);
        }
    }

    int ans = dp[12][M].x;
    cout << ans << en;
    return;
}

int main(void){
    cin.tie(0);cout.tie(0);ios_base::sync_with_stdio(0);cout<<fixed<<setprecision(15);
    int t=1; //cin>>t;
    while(t--) Main();
    return 0;
}
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
#define REP(i,n) for(int i=0,_n=(int)(n);i<_n;++i)
#define ALL(v) (v).begin(),(v).end()
#define CLR(t,v) memset(t,(v),sizeof(t))
template<class T1,class T2>ostream& operator<<(ostream& os,const pair<T1,T2>&a){return os<<"("<<a.first<<","<<a.second<< ")";}
template<class T>void chmin(T&a,const T&b){if(a>b)a=b;}
template<class T>void chmax(T&a,const T&b){if(a<b)a=b;}
#ifdef LOCAL
template<class T>void pv(T a,T b){for(T i=a;i!=b;++i)cerr<<(*i)<<" ";cerr<<endl;}
#else
template<class T>void pv(T a,T b){}
#endif

ll nextLong() { ll x; scanf("%lld", &x); return x;}

int main2() {
  ll N = nextLong();
  map<ll, ll> count;
  REP(i, N) {
    count[nextLong()]++;
  }
  ll ans = N * (N-1)/2;
  for (auto p : count) {
    ll n = p.second;
    ans -= n * (n-1) / 2;
  }
  cout << ans << endl;
  return 0;
}

int main() {

#ifdef LOCAL
  for (;!cin.eof();cin>>ws)
#endif
    main2();
  return 0;
}
