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

#define ms(s, n) memset(s, n, sizeof(s))
#define FOR(i, a, b) for (int i = (a); i < (b); i++)
#define FORd(i, a, b) for (int i = (a) - 1; i >= (b); i--)
#define FORall(it, a) for (__typeof((a).begin()) it = (a).begin(); it != (a).end(); it++)
#define sz(a) int((a).size())
#define present(t, x) (t.find(x) != t.end())
#define all(a) (a).begin(), (a).end()
#define uni(a) (a).erase(unique(all(a)), (a).end())
#define pb push_back
#define pf push_front
#define mp make_pair
#define fi first
#define se second
#define prec(n) fixed<<setprecision(n)
#define bit(n, i) (((n) >> (i)) & 1)
#define bitcount(n) __builtin_popcountll(n)
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int, int> pi;
typedef vector<int> vi;
typedef vector<pi> vii;
const int MOD = (int) 1e9 + 7;
const int INF = (int) 1e9;
const ll LINF = (ll) 1e18;
const ld PI = acos((ld) -1);
const ld EPS = 1e-9;
inline ll gcd(ll a, ll b) {ll r; while (b) {r = a % b; a = b; b = r;} return a;}
inline ll lcm(ll a, ll b) {return a / gcd(a, b) * b;}
inline ll fpow(ll n, ll k, int p = MOD) {ll r = 1; for (; k; k >>= 1) {if (k & 1) r = r * n % p; n = n * n % p;} return r;}
template<class T> inline int chkmin(T& a, const T& val) {return val < a ? a = val, 1 : 0;}
template<class T> inline int chkmax(T& a, const T& val) {return a < val ? a = val, 1 : 0;}
inline ll isqrt(ll k) {ll r = sqrt(k) + 1; while (r * r > k) r--; return r;}
inline ll icbrt(ll k) {ll r = cbrt(k) + 1; while (r * r * r > k) r--; return r;}
inline void addmod(int& a, int val, int p = MOD) {if ((a = (a + val)) >= p) a -= p;}
inline void submod(int& a, int val, int p = MOD) {if ((a = (a - val)) < 0) a += p;}
inline int mult(int a, int b, int p = MOD) {return (ll) a * b % p;}
inline int inv(int a, int p = MOD) {return fpow(a, p - 2, p);}
inline int sign(ld x) {return x < -EPS ? -1 : x > +EPS;}
inline int sign(ld x, ld y) {return sign(x - y);}
#define db(x) cout << #x << " = " << (x) << "\n";

const int maxn = 2e5 + 5;
int n, x, y;
int c[maxn];
int w[maxn];
int dj[maxn];
int sz[maxn];
vi g[maxn];
int fac[maxn];
int ifac[maxn];
map<int, int> hs[maxn];
vi gg[maxn];

int binom(int a, int b) {
	if (a < 0 || a > b) return 0;
	if (!a || a == b) return 1;
	return mult(fac[b], mult(ifac[a], ifac[b - a]));
}

void init() {
	FOR(i, 0, n) dj[i] = i, sz[i] = 1;
}
int find(int u) {
	return dj[u] == u ? dj[u] : dj[u] = find(dj[u]);
}
void join(int u, int v) {
	int p = find(u);
	int q = find(v);
	if (p != q) {
		dj[p] = q;
		sz[q] += sz[p];
	}
}

int compare(int i, int j) {
	if (w[i] != w[j]) return w[i] < w[j];
	return i < j;
}

void solve() {
	fac[0] = 1; FOR(i, 1, maxn) fac[i] = mult(fac[i - 1], i);
	FOR(i, 0, maxn) ifac[i] = inv(fac[i]);
	cin >> n >> x >> y;
	FOR(i, 0, n) {
		cin >> c[i] >> w[i];
		gg[c[i]].pb(i);
	}
	vi ver; FOR(i, 0, n) ver.pb(i);
	sort(all(ver), compare);
	int u = ver[0], v = -1;
	FOR(i, 1, n) if (c[ver[i]] != c[u]) {
		v = ver[i];
		break;
	}
	init();
	FOR(i, 0, n) {
		if (c[u] == c[i] && w[u] + w[i] <= x) {
			join(u, i);
		}
		else if (c[u] != c[i] && w[u] + w[i] <= y) {
			join(u, i);
		}
	}
	if (v != -1) {
		FOR(i, 0, n) {
			if (c[v] == c[i] && w[v] + w[i] <= x) {
				join(v, i);
			}
			else if (c[v] != c[i] && w[v] + w[i] <= y) {
				join(v, i);
			}
		}
	}
	FOR(i, 0, maxn) {
		sort(all(gg[i]), compare);
		FOR(j, 0, sz(gg[i])) {
			int u = gg[i][0];
			int v = gg[i][j];
			if (c[u] == c[v] && w[u] + w[v] <= x) {
				join(u, v);
			}
			else if (c[u] != c[v] && w[u] + w[v] <= y) {
				join(u, v);
			}
		}
	}
	FOR(i, 0, n) {
		hs[find(i)][c[i]]++;
	}
	int ans = 1;
	FOR(i, 0, n) {
		int cnt = 0;
		FORall(it, hs[i]) {
			cnt += it->se;
			ans = mult(ans, binom(it->se, cnt));
		}
	}
	cout << ans << "\n";
}

int main() {
	ios_base::sync_with_stdio(0); //cin.tie(0);
#ifdef _LOCAL_
	freopen("in.txt", "r", stdin); //freopen("out.txt", "w", stdout);
#endif
	solve();
#ifdef _LOCAL_
	//printf("\nTime elapsed: %dms", 1000 * clock() / CLOCKS_PER_SEC);
#endif
	return 0;
}

Measured memory_bytes: 38516