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 */
#pragma GCC target("sse4,tune=native")
#pragma GCC optimize("O3","unroll-loops")
#include <iostream>
#include <complex>
#include <vector>
#include <string>
#include <algorithm>
#include <cstdio>
#include <numeric>
#include <cstring>
#include <ctime>
#include <cstdlib>
#include <set>
#include <map>
#include <unordered_map>
#include <unordered_set>
#include <list>
#include <cmath>
#include <bitset>
#include <cassert>
#include <queue>
#include <stack>
#include <deque>
    
     
using namespace std;
template<typename T1, typename T2>inline void chkmin(T1 &x, T2 y) { if (x > y) x = y; }
template<typename T1, typename T2>inline void chkmax(T1 &x, T2 y) { if (x < y) x = y; } 
template<typename T, typename U> inline ostream &operator<< (ostream &_out, const pair<T, U> &_p) { _out << _p.first << ' ' << _p.second; return _out; }
template<typename T, typename U> inline istream &operator>> (istream &_in, pair<T, U> &_p) { _in >> _p.first >> _p.second; return _in; }
template<typename T> inline ostream &operator<< (ostream &_out, const vector<T> &_v) { if (_v.empty()) { return _out; } _out << _v.front(); for (auto _it = ++_v.begin(); _it != _v.end(); ++_it) { _out << ' ' << *_it; } return _out; }
template<typename T> inline istream &operator>> (istream &_in, vector<T> &_v) { for (auto &_i : _v) { _in >> _i; } return _in; }
template<typename T> inline ostream &operator<< (ostream &_out, const set<T> &_s) { if (_s.empty()) { return _out; } _out << *_s.begin(); for (auto _it = ++_s.begin(); _it != _s.end(); ++_it) { _out << ' ' << *_it; } return _out; }
template<typename T> inline ostream &operator<< (ostream &_out, const multiset<T> &_s) { if (_s.empty()) { return _out; } _out << *_s.begin(); for (auto _it = ++_s.begin(); _it != _s.end(); ++_it) { _out << ' ' << *_it; } return _out; }
template<typename T> inline ostream &operator<< (ostream &_out, const unordered_set<T> &_s) { if (_s.empty()) { return _out; } _out << *_s.begin(); for (auto _it = ++_s.begin(); _it != _s.end(); ++_it) { _out << ' ' << *_it; } return _out; }
template<typename T> inline ostream &operator<< (ostream &_out, const unordered_multiset<T> &_s) { if (_s.empty()) { return _out; } _out << *_s.begin(); for (auto _it = ++_s.begin(); _it != _s.end(); ++_it) { _out << ' ' << *_it; } return _out; }
template<typename T, typename U> inline ostream &operator<< (ostream &_out, const map<T, U> &_m) { if (_m.empty()) { return _out; } _out << '(' << _m.begin()->first << ": " << _m.begin()->second << ')'; for (auto _it = ++_m.begin(); _it != _m.end(); ++_it) { _out << ", (" << _it->first << ": " << _it->second << ')'; } return _out; }
template<typename T, typename U> inline ostream &operator<< (ostream &_out, const unordered_map<T, U> &_m) { if (_m.empty()) { return _out; } _out << '(' << _m.begin()->first << ": " << _m.begin()->second << ')'; for (auto _it = ++_m.begin(); _it != _m.end(); ++_it) { _out << ", (" << _it->first << ": " << _it->second << ')'; } return _out; }
#define sz(c) (int)(c).size()
#define all(c) (c).begin(), (c).end()
#define rall(c) (c).rbegin(), (c).rend()
#define left left228
#define right right228
#define next next228
#define rank rank228
#define prev prev228
#define y1 y1228                                                         
#define read(FILENAME) freopen((FILENAME + ".in").c_str(), "r", stdin)
#define write(FILENAME) freopen((FILENAME + ".out").c_str(), "w", stdout)
#define files(FILENAME) read(FILENAME), write(FILENAME)
#define pb push_back
const string FILENAME = "input";
const int MAXN = 200228;
const int Mod = 1000000007;



int mul(int a, int b) {
	return (1LL * a * b) % Mod;
}


int powm(int a, int b) {
	if (b == 0) {
		return 1;
	}
	if (b & 1) {
		return mul(a, powm(a, b - 1));
	}
	int g = powm(a, b >> 1);
	return mul(g, g);
}

//17:47
//19:37
int n, x, y;
int c[MAXN], w[MAXN];
int minw[MAXN];
int cnt[MAXN];


int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
//	read(FILENAME);
	cin >> n >> x >> y;
	for (int i = 0; i <= n; i++) {
		minw[i] = 1e9;
	}
	for (int i = 0; i < n; i++) {
		cin >> c[i] >> w[i];
		if (minw[c[i]] > w[i]) {
			minw[c[i]] = w[i];
		}
	}
	int c1 = 0;
	int c2 = 0;
	for (int i = 1; i <= n; i++) {
		if (minw[c1] > minw[i]) {
			c2 = c1;
			c1 = i;
		} else if (minw[c2] > minw[i]) {
			c2 = i;
		}
	}
	for (int i = 0; i < n; i++) {
		if (c[i] != c1 && w[i] + minw[c1] <= y) {
			cnt[c[i]]++;
			continue;
		}
		if (c[i] != c2 && w[i] + minw[c2] <= y) {
			cnt[c[i]]++;
			continue;
		}
		if (w[i] + minw[c[i]] <= x && minw[c[i]] + minw[c1] <= y) {
			cnt[c[i]]++;
			continue;
		}
	}
	int cur = 0;
	int ans = 1;
	int del = 1;
	for (int i = 1; i <= n; i++) {
		for (int j = 1; j <= cnt[i]; j++) {
			cur++;
			ans = mul(ans, cur);
			del = mul(del, j);
		}
	}
	ans = mul(ans, powm(del, Mod - 2));
	cout << ans << '\n';
	return 0;			
}


Measured memory_bytes: 3456