// Slower C++ solution:
#include<iostream>

#include<cstdio>

#include<algorithm>

using namespace std;

typedef long long ll;

ll inv[201000],fac[201000],mod=1e9+7;

int n,x,y,w1=1999999999,c1,id1,w2=1999999999,c2,id2;

struct xxx{int w,c;}d[201000]; bool used[201000];int cnt[201000],sum=0;

int h[201000],nxt[5001000],K=0,to[5001000];

void ins(int u,int v){nxt[++K]=h[u];h[u]=K;to[K]=v;}

bool cmp(xxx a,xxx b){return a.c<b.c;}

ll ksm(ll k,int p)

{

	ll ans=1ll;while(p){if(p&1)ans=(ans*k)%mod;k=(k*k)%mod;p>>=1;}

	return ans;

}

void init()

{

	fac[0]=inv[0]=1ll;for(int i=1;i<=n;i++)fac[i]=(fac[i-1]*i)%mod;

	inv[n]=ksm(fac[n],mod-2);for(int i=n-1;i>=1;i--)inv[i]=(inv[i+1]*(i+1))%mod;

}

void dfs(int x)

{

	if(used[x])return;cnt[d[x].c]++;used[x]=1;sum++;

	for(int i=h[x];i;i=nxt[i])dfs(to[i]);

}

int main()

{

	scanf("%d%d%d",&n,&x,&y);

	for(int i=1;i<=n;i++)scanf("%d%d",&d[i].c,&d[i].w);

	sort(d+1,d+n+1,cmp);//for(int i=1;i<=n;i++)cout<<d[i].c<<" "<<d[i].w<<endl<<endl;

	for(int i=1;i<=n;i++)

	if(d[i].w<=w1){if(d[i].c!=c1)swap(w1,w2),swap(c1,c2),swap(id1,id2);w1=d[i].w;c1=d[i].c;id1=i;}

	else if(d[i].w<=w2&&d[i].c!=c1){w2=d[i].w;c2=d[i].c;id2=i;}

	int k;

	for(int i=1;i<=n;)

	{

		int j=i,Min=d[i].w,col=d[i].c;k=i;

		while(d[i].c==col){if(Min>d[i].w)Min=d[i].w,k=i;i++;}i=j;//cout<<Min<<" "<<i<<endl;

		while(d[i].c==col){if(d[i].w+Min<=x)ins(i,k),ins(k,i);i++;}

	}

	for(int i=1;i<=n;i++)if(d[i].c!=c1&&d[i].w+w1<=y)ins(i,id1),ins(id1,i);

	if(c2!=0)for(int i=1;i<=n;i++)if(d[i].c==c1&&d[i].w+w2<=y)ins(i,id2),ins(id2,i);

//	for(int i=1;i<=n;i++,cout<<endl)for(int j=h[i];j;j=nxt[j])cout<<to[j]<<" ";

	dfs(id1);init();ll ans=fac[sum];

	for(int i=1;i<=n;i++)ans=(ans*inv[cnt[i]])%mod;

	printf("%lld",ans);return 0;

}

 //把能互相交换的处理出来，

 //1.同一种颜色：把每种颜色最小的与这种颜色其他球连边 (<=x)

 //2.不同种颜色：取所有球中的最小值（记颜色为c），与它不同颜色的球连边(<=y)，再取一个不同于c颜色的最小值，把它与c颜色的球连边(<=y) 

 //3.计算答案：从2的c开始跑dfs，有被遍历到的球就把它的颜色的出现次数++，设颜色为col的球的出现次数acol，总数为sum，

 //则答案可以看成从sum个位置中选a1个位置填颜色1，再从sum-a1个位置中选a2个位置填颜色2......，则ans=C(sum,a1)*C(sum-a1,a2)*C(sum-a1-a2,a3)...... =sum!/(a1!*a2!......)

// Faster C++ solution for the same problem (measured speedup: 5.07453791127532x):
#include<cstdio>

#include<algorithm>

#define fo(i,a,b) for(i=a;i<=b;i++)

#define fd(i,a,b) for(i=a;i>=b;i--)

using namespace std;

typedef long long ll;

const int maxn=200000+10,mo=1000000007,inf=1000000005;

int mi[maxn],c[maxn],w[maxn],cnt[maxn],fac[maxn],inv[maxn];

int i,j,k,l,t,n,m,ans,num,x,y;

int qsm(int x,int y){

    if (!y) return 1;

    int t=qsm(x,y/2);

    t=(ll)t*t%mo;

    if (y%2) t=(ll)t*x%mo;

    return t;

}

int C(int n,int m){

    if (n<m||m<0) return 0;

    return (ll)fac[n]*inv[m]%mo*inv[n-m]%mo;

}

int main(){

    scanf("%d%d%d",&n,&x,&y);

    fo(i,1,n) mi[i]=inf;

    fac[0]=1;

    fo(i,1,n) fac[i]=(ll)fac[i-1]*i%mo;

    inv[n]=qsm(fac[n],mo-2);

    fd(i,n-1,0) inv[i]=(ll)inv[i+1]*(i+1)%mo;

    fo(i,1,n){

        scanf("%d%d",&c[i],&w[i]);

        mi[c[i]]=min(mi[c[i]],w[i]);

        cnt[c[i]]++;

    }

    fo(i,1,n) 

        if (mi[i]!=inf){

            if (m==0) m=i;

            else if (mi[i]<mi[m]) m=i;

        }

    t=inf;

    fo(i,1,n)

        if (mi[i]!=inf&&i!=m) t=min(t,mi[i]);

    fo(i,1,n){

        if (w[i]!=mi[c[i]]&&w[i]+mi[c[i]]<=x) continue;

        if (c[i]!=m&&w[i]+mi[m]<=y) continue;

        if (c[i]==m&&w[i]+t<=y) continue;

        cnt[c[i]]--;

    }

    num=cnt[m];

    fo(i,1,n)

        if (mi[i]!=inf&&i!=m)

            if (mi[i]+mi[m]<=y) num+=cnt[i];

    ans=1;

    fo(i,1,n)

        if (mi[i]!=inf&&(i==m||mi[i]+mi[m]<=y)){

            ans=(ll)ans*C(num,cnt[i])%mo;

            num-=cnt[i];

        }

    printf("%d\n",ans);

}