#include<stdio.h>
#include<iostream>
#include<vector>
#include<algorithm>
#include<string>
#include<string.h>
using namespace std;

typedef long long LL;
typedef vector<int> VI;

#define REP(i,n) for(int i=0, i##_len=(n); i<i##_len; ++i)
#define EACH(i,c) for(__typeof((c).begin()) i=(c).begin(),i##_end=(c).end();i!=i##_end;++i)
#define eprintf(...) fprintf(stderr, __VA_ARGS__)

template<class T> inline void amin(T &x, const T &y) { if (y<x) x=y; }
template<class T> inline void amax(T &x, const T &y) { if (x<y) x=y; }
template<class Iter> void rprintf(const char *fmt, Iter begin, Iter end) {
    for (bool sp=0; begin!=end; ++begin) { if (sp) putchar(' '); else sp = true; printf(fmt, *begin); }
    putchar('\n');
}
struct UnionFind {
    int n, cc, *u;
    UnionFind() : n(0), cc(0), u(NULL) {}
    UnionFind(int n_) : n(n_), cc(n_) {
	u = new int[n_];
	memset(u, -1, sizeof (int) * n);
    }
    UnionFind(const UnionFind &y) : n(y.n), cc(y.cc) {
	u = new int[y.n];
	memcpy(u, y.u, sizeof (int) * n);
    }
    ~UnionFind() {
	delete[] u; u = NULL;
	n = cc = 0;
    }
    friend void swap(UnionFind &x, UnionFind &y) {
	swap(x.n, y.n); swap(x.cc, y.cc); swap(x.u, y.u);
    }
    UnionFind& operator=(UnionFind y) { 
	swap(*this, y);
	return *this;
    }
    int root(int x) {
	int y = x, t;
	while (u[y] >= 0) y = u[y];
	while (x != y) { t = u[x]; u[x] = y; x = t; }
	return y;
    }
    bool link(int x, int y) {
	x = root(x); y = root(y);
	if (x == y) return false;
	if (u[y] < u[x]) swap(x, y);
	u[x] += u[y]; u[y] = x; cc--;
	return true;
    }
    bool same(int x, int y) { return root(x) == root(y); }
    int size(int x) { return -u[root(x)]; }
    int count() { return cc; }
};

template<unsigned MOD> struct ModInt {
    static const unsigned static_MOD = MOD;
    unsigned x;
    void undef() { x = (unsigned)-1; }
    bool isnan() const { return x == (unsigned)-1; }
    inline int geti() const { return (int)x; }
    ModInt() { x = 0; }
    ModInt(const ModInt &y) { x = y.x; }
    ModInt(int y) { if (y<0 || (int)MOD<=y) y %= (int)MOD; if (y<0) y += MOD; x=y; }
    ModInt(unsigned y) { if (MOD<=y) x = y % MOD; else x = y; }
    ModInt(long long y) { if (y<0 || MOD<=y) y %= MOD; if (y<0) y += MOD; x=y; }
    ModInt(unsigned long long y) { if (MOD<=y) x = y % MOD; else x = y; }
    ModInt &operator+=(const ModInt y) { if ((x += y.x) >= MOD) x -= MOD; return *this; }
    ModInt &operator-=(const ModInt y) { if ((x -= y.x) & (1u<<31)) x += MOD; return *this; }
    ModInt &operator*=(const ModInt y) { x = (unsigned long long)x * y.x % MOD; return *this; }
    ModInt &operator/=(const ModInt y) { x = (unsigned long long)x * y.inv().x % MOD; return *this; }
    ModInt operator-() const { return (x ? MOD-x: 0); }

    ModInt inv() const {
	unsigned a = MOD, b = x; int u = 0, v = 1;
	while (b) {
	    int t = a / b;
	    a -= t * b; swap(a, b);
	    u -= t * v; swap(u, v);
	}
	if (u < 0) u += MOD;
	return ModInt(u);
    }
    ModInt pow(long long y) const {
	ModInt b = *this, r = 1;
	if (y < 0) { b = b.inv(); y = -y; }
	for (; y; y>>=1) {
	    if (y&1) r *= b;
	    b *= b;
	}
	return r;
    }
    friend ModInt operator+(ModInt x, const ModInt y) { return x += y; }
    friend ModInt operator-(ModInt x, const ModInt y) { return x -= y; }
    friend ModInt operator*(ModInt x, const ModInt y) { return x *= y; }
    friend ModInt operator/(ModInt x, const ModInt y) { return x *= y.inv(); }
    friend bool operator<(const ModInt x, const ModInt y) { return x.x < y.x; }
    friend bool operator==(const ModInt x, const ModInt y) { return x.x == y.x; }
    friend bool operator!=(const ModInt x, const ModInt y) { return x.x != y.x; }
};

const LL MOD = 1000000007;
typedef ModInt<MOD> Mint;

const int MAX = 200011;
Mint inv[MAX+1], fact[MAX+1], fact_inv[MAX+1];

void init() {
    inv[1] = 1;
    for (int i=2; i<=MAX; i++) inv[i] = inv[MOD%i] * (MOD-MOD/i);

    fact[0] = fact_inv[0] = 1;
    for (int i=1; i<=MAX; i++) {
	fact[i] = fact[i-1] * i;
	fact_inv[i] = fact_inv[i-1] * inv[i];
    }
}

int N;
LL X, Y;
int C[200011];
LL W[200011];

vector<pair<LL, int> > G[200011];
VI H[200011];

void MAIN() {
    init();

    scanf("%d%lld%lld", &N, &X, &Y);
    REP (i, N) {
	scanf("%d%lld", C+i, W+i);
	C[i]--;
	G[C[i]].emplace_back(W[i], i);
    }

    UnionFind U(N);
    int color0 = -1, color1 = -1;
    pair<LL, int> mi0, mi1;

    REP (c, N) if (!G[c].empty()) {
	pair<LL, int> p = *min_element(G[c].begin(), G[c].end());
	if (color1 == -1 || mi1 > p) {
	    color1 = c;
	    mi1 = p;
	    if (color0 == -1 || mi0 > mi1) {
		swap(color0, color1);
		swap(mi0, mi1);
	    }
	}
	EACH (e, G[c]) {
	    if (e->first + p.first <= X) U.link(e->second, p.second);
	}
    }
    REP (c, N) if (!G[c].empty()) {
	EACH (e, G[c]) {
	    if (c != color0 && e->first + mi0.first <= Y) U.link(e->second, mi0.second);
	    if (c != color1 && e->first + mi1.first <= Y) U.link(e->second, mi1.second);
	}
    }
    REP (i, N) H[U.root(i)].push_back(C[i]);

    Mint ans = 1;
    REP (t, N) if (!H[t].empty()) {
	VI &v = H[t];
	sort(v.begin(), v.end());
	ans *= fact[v.size()];
	for (int i=0, j=0; i<(int)v.size(); i=j) {
	    while (j < (int)v.size() && v[i] == v[j]) j++;
	    ans *= fact_inv[j-i];
	}
    }
    printf("%d\n", ans.geti());
}

int main() {
    int TC = 1;
//    scanf("%d", &TC);
    REP (tc, TC) MAIN();
    return 0;
}



Measured memory_bytes: 26368