import java.io.*;
import java.util.*;

public class B {

	static int n,t[],g[],MOD=(int)1e9+7;
	static int [][][]memo1,memo2[],memo3[];
	static int dp1(int idx,int remCnt,int remSum) {
		if(remCnt==0)
			return remSum==0?1:0;
		if(remSum==0 || idx==n)
			return 0;
		if(memo1[idx][remCnt][remSum]!=-1)
			return memo1[idx][remCnt][remSum];
		int ans=dp1(idx+1,remCnt,remSum);
		if(g[idx]==0 && t[idx]<=remSum)
		{
			ans+=dp1(idx+1,remCnt-1,remSum-t[idx]);
			if(ans>=MOD)
				ans-=MOD;
		}
		return memo1[idx][remCnt][remSum]=ans;
	}
	static int dp2(int idx,int remCnt1,int remCnt2,int remSum) {
		int all=remCnt1+remCnt2;
		if(all==0)
			return remSum==0?1:0;
		if(idx==n || remSum==0)
			return 0;
		if(memo2[idx][remCnt1][remCnt2][remSum]!=-1)
			return memo2[idx][remCnt1][remCnt2][remSum];
		int ans=dp2(idx+1,remCnt1,remCnt2,remSum);
		if(t[idx]<=remSum) {
			if(g[idx]==1 && remCnt1>0)
				ans+=dp2(idx+1,remCnt1-1,remCnt2,remSum-t[idx]);
			else if(g[idx]==2 && remCnt2>0)
				ans+=dp2(idx+1,remCnt1,remCnt2-1,remSum-t[idx]);
				
		}
		
		return memo2[idx][remCnt1][remCnt2][remSum]=ans;
	}
	private static int dp3(int cnt0, int cnt1, int cnt2,int last) {
		if(cnt0+cnt1+cnt2==0)
			return 1;
		if(memo3[last][cnt0][cnt1][cnt2]!=-1)
			return memo3[last][cnt0][cnt1][cnt2];
		long ans=0;
		if(cnt0>0 && last!=0)
			ans+=dp3(cnt0-1,cnt1,cnt2,0);
		if(cnt1>0 && last!=1)
			ans+=dp3(cnt0,cnt1-1,cnt2,1);
		if(cnt2>0 && last!=2)
			ans+=dp3(cnt0,cnt1,cnt2-1,2);
		return  memo3[last][cnt0][cnt1][cnt2]=(int) (ans%MOD);
		
	}
	public static void main(String[] args) throws IOException {
		Scanner sc = new Scanner();
		PrintWriter out = new PrintWriter(System.out);
		n=sc.nextInt();
		int []fac=new int [n+1];
		t=new int [n];
		g=new int [n];
		int []cnt=new int [3];
		fac[0]=1;
		for(int i=1;i<=n;i++)
			fac[i]=(int) (i*1L*fac[i-1]%MOD);
		int T=sc.nextInt();
		for(int i=0;i<n;i++) {
			t[i]=sc.nextInt();
			g[i]=sc.nextInt()-1;
			cnt[g[i]]++;
			
		}
		memo1=new int [n][cnt[0]+1][T+1];
		memo2=new int [n][cnt[1]+1][cnt[2]+1][T+1];
		memo3=new int [4][cnt[0]+1][cnt[1]+1][cnt[2]+1];
		for(int i=0;i<n;i++) {
			for(int j=0;j<=cnt[0];j++) 
				Arrays.fill(memo1[i][j], -1);
			for(int j=0;j<=cnt[1];j++) 
				for(int k=0;k<=cnt[2];k++)
					Arrays.fill(memo2[i][j][k], -1);
			
		}
		for(int i=0;i<4;i++)
			for(int j=0;j<=cnt[0];j++)
				for(int k=0;k<=cnt[1];k++)
					Arrays.fill(memo3[i][j][k], -1);
		int ans=0;
		for(int cnt0=0;cnt0<=cnt[0];cnt0++)
			for(int sum0=0;sum0<=T;sum0++)
				for(int cnt1=0;cnt1<=cnt[1];cnt1++)
					for(int cnt2=0;cnt2<=cnt[2];cnt2++) {
						long ways= dp1(0,cnt0,sum0)*1L*dp2(0,cnt1,cnt2,T-sum0)%MOD;
						ways=ways*dp3(cnt0,cnt1,cnt2,3)%MOD;
						ways*=fac[cnt0];
						ways%=MOD;
						ways*=fac[cnt1];
						ways%=MOD;
						ways*=fac[cnt2];
						ways%=MOD;
						ans+=ways;
						if(ans>=MOD)
							ans-=MOD;
					}
		out.println(ans);
		out.close();

	}

	

	static class Scanner {
		BufferedReader br;
		StringTokenizer st;

		Scanner() {
			br = new BufferedReader(new InputStreamReader(System.in));
		}

		Scanner(String fileName) throws FileNotFoundException {
			br = new BufferedReader(new FileReader(fileName));
		}

		String next() throws IOException {
			while (st == null || !st.hasMoreTokens())
				st = new StringTokenizer(br.readLine());
			return st.nextToken();
		}

		String nextLine() throws IOException {
			return br.readLine();
		}

		int nextInt() throws IOException {
			return Integer.parseInt(next());
		}

		long nextLong() throws NumberFormatException, IOException {
			return Long.parseLong(next());
		}

		double nextDouble() throws NumberFormatException, IOException {
			return Double.parseDouble(next());
		}

		boolean ready() throws IOException {
			return br.ready();
		}

	}

}