#include <bits/stdc++.h>
#define ADD(a, b) a = (a + ll(b)) % mod
#define MUL(a, b) a = (a * ll(b)) % mod
#define MAX(a, b) a = max(a, b)
#define MIN(a, b) a = min(a, b)
#define rep(i, a, b) for(int i = int(a); i < int(b); i++)
#define rer(i, a, b) for(int i = int(a) - 1; i >= int(b); i--)
#define all(a) (a).begin(), (a).end()
#define sz(v) (int)(v).size()
#define pb push_back
#define sec second
#define fst first
#define debug(fmt, ...) Debug(__LINE__, ":", fmt, ##__VA_ARGS__)
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> pi;
typedef pair<ll, ll> pl;
typedef pair<int, pi> ppi;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<vl> mat;
typedef complex<double> comp;
void Debug() {cout << '\n'; }
template<class FIRST, class... REST>void Debug(FIRST arg, REST... rest){
	cout<<arg<<" ";Debug(rest...);}
template<class T>ostream& operator<<(ostream& out,const vector<T>& v) {
	out<<"[";if(!v.empty()){rep(i,0,sz(v)-1)out<<v[i]<<", ";out<<v.back();}out<<"]";return out;}
template<class S, class T>ostream& operator<<(ostream& out,const pair<S, T>& v){
	out<<"("<<v.first<<", "<<v.second<<")";return out;}
const int MAX_N = 200010;
const int MAX_V = 100010;
const double eps = 1e-6;
const ll mod = 1000000007;
const int inf = 1 << 29;
const ll linf = 1LL << 60;
const double PI = 3.14159265358979323846;
///////////////////////////////////////////////////////////////////////////////////////////////////

struct UF {
	vector<int> par, ran;
	void init(int n) {
		par.resize(n); ran.resize(n);
		for(int i = 0; i < n; i++) {
			par[i] = i;
			ran[i] = 0;
		}
	}
	UF(int mx = 0) { init(mx); }

	int find(int x) {
		if(par[x] == x) return x;
		else return par[x] = find(par[x]);
	}
	void unite(int x, int y) {
		x = find(x);
		y = find(y);
		if(x == y) return;
		if(ran[x] < ran[y]) {
			par[x] = y;
		}
		else {
			par[y] = x;
			if(ran[x] == ran[y]) ran[x]++;
		}
	}
	bool same(int x, int y) { return find(x) == find(y); }
};

ll fac[MAX_N], inv[MAX_N], fiv[MAX_N]; //fiv:inv(fac(i))

ll mod_pow(ll a, ll n) {
	if(n == 0) return 1;
	ll res = mod_pow(a, n / 2);
	if(n % 2 == 0) return res * res % mod;
	else return a * res % mod * res % mod;
}

ll invf(ll a) {
	return mod_pow(a, mod - 2);
}

void C_init(int n) {
	fac[0] = fac[1] = 1; inv[1] = 1;
	fiv[0] = fiv[1] = 1;
	rep(i, 2, n + 1) {
		fac[i] = fac[i - 1] * i % mod;
		inv[i] = mod - inv[mod % i] * (mod / i) % mod;
		fiv[i] = fiv[i - 1] * inv[i] % mod;
	}
}

ll C_(int a, int b) { //assume a >= b
	if(a < b || a < 0 || b < 0) return 0;
	return fac[a] * fiv[b] % mod * fiv[a - b] % mod;
}

int N; ll X, Y;

vector<pl> group[MAX_N];
pl mel[MAX_N];
ll C[MAX_N], W[MAX_N];

vector<int> con[MAX_N];
int cnt[MAX_N];

void solve() {
	cin >> N >> X >> Y;
	C_init(N);
	rep(i, 0, N) {
		cin >> C[i] >> W[i]; C[i]--;
		group[C[i]].pb(pl(i, W[i]));
	}
	UF uf(N);
	fill(mel, mel + N, pl(linf, linf));
	rep(i, 0, N) {
		vector<pl>& g = group[i];
		int at = -1;
		ll w = linf;
		rep(i, 0, sz(g)) {
			pl p = g[i];
			if(w > p.sec) {
				w = p.sec;
				at = p.fst;
			}
		}
		mel[i] = pl(w, at);
		rep(i, 0, sz(g)) {
			pl p = g[i];
			if(p.sec + w <= X) uf.unite(at, p.fst);
		}
	}
	sort(mel, mel + N);

	rep(i, 0, min(2, N)) {
		int at = mel[i].sec;
		ll w = mel[i].fst;
		rep(j, 0, N) {
			if(C[at] != C[j] && w + W[j] <= Y) uf.unite(j, at);
		}
	}

	rep(i, 0, N) con[uf.find(i)].pb(i);

	ll ans = 1;
	int at = uf.find(mel[0].sec);
	vi& vec = con[at];
	rep(i, 0, sz(vec)) cnt[C[vec[i]]]++;
	ans = fac[sz(vec)];
	rep(i, 0, N) MUL(ans, fiv[cnt[i]]);
	cout << ans << "\n";
}

int main() {
#ifndef LOCAL
	ios::sync_with_stdio(false);
    cin.tie(0);
#endif
    cout << fixed;
	cout.precision(20);
	srand((unsigned int)time(NULL));
#ifdef LOCAL
	//freopen("in.txt", "wt", stdout); //for tester
    freopen("in.txt", "rt", stdin);
#endif	
	solve();
#ifdef LOCAL
    cerr << "Time elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << " s.\n";
#endif
	return 0;
}



Measured memory_bytes: 34176