using System;
using System.Collections.Generic;
using System.Collections;
using System.Collections.Specialized;
using System.Linq;
using System.Text;
using System.IO;
using System.Reflection;
using static System.Math;
using System.Numerics;
static class Program{
	const int mod=(int)1e9+7;
	const double eps=1e-11;
	static void Main(){
		Sc sc=new Sc();
		var s=sc.Ia;
		var h=sc.Arr(s[1],()=>sc.Ia);
		St st=new St(s[0]+1);
		st.Ud3(1,1,1);
		var p=new long[s[1]];
		for(int i = 0;i<s[2];i++) {
			for(int j = 0;j<s[1];j++) {p[j]=st.Get(h[j][0],h[j][1]);}
			st.Ud3(1,s[0],0);
			for(int j = 0;j<s[1];j++) {st.Ud2(h[j][0],h[j][1],p[j]);}
		}
		Console.WriteLine("{0}",st.Get(s[0],s[0]));
	}
}
public class St{
	public Mint[] dat,dat2,dat3;
	private bool[] bo3;
	private int m=1,cnt=0;
	public St(int n){
		while(m<n){m<<=1;}
		cnt=m+n-1;
		dat=new Mint[cnt];
		dat2=new Mint[cnt+1];
		dat3=new Mint[cnt+1];
		bo3=new bool[cnt];
	}
	private Mint Fdg(int a,int b,int k,int l,int r){
		if(k>=cnt){return 0;}
		if(bo3[k]){
			dat[k]=dat3[k];
			if(2*k+1<cnt){dat3[2*k+1]=dat3[k]/2;bo3[2*k+1]=true;dat2[2*k+1]=0;}
			if(2*k+2<cnt){dat3[2*k+2]=dat3[k]/2;bo3[2*k+2]=true;dat2[2*k+2]=0;}
			bo3[k]=false;
		}
		if((long)dat2[k]!=0){
			dat[k]+=dat2[k];
			if(2*k+1<cnt){dat2[2*k+1]+=dat2[k]/2;}
			if(2*k+2<cnt){dat2[2*k+2]+=dat2[k]/2;}
			dat2[k]=0;
		}
		if(r<a||b<l){return 0;}
		if(a<=l&&r<=b){return dat[k];}
		else{return Fdg(a,b,k*2+1,l,(l+r)>>1)+Fdg(a,b,k*2+2,(l+r+1)>>1,r);}
	}
	public long Get(int a,int b){return (long)Fdg(a,b,0,0,m-1);}
	public void Ud2(int a,int b,long d){Hn(a,b,0,0,m-1,d*m);}
	private long Hn(int a,int b,int k,int l,int r,long d){
		if(a<=l&&r<=b){dat2[k]+=d;return d;}
		else if(r>=a&&b>=l){
			if(bo3[k]){
				dat[k]=dat3[k];
				if(2*k+1<cnt){dat3[2*k+1]=dat3[k]/2;bo3[2*k+1]=true;dat2[2*k+1]=0;}
				if(2*k+2<cnt){dat3[2*k+2]=dat3[k]/2;bo3[2*k+2]=true;dat2[2*k+2]=0;}
				bo3[k]=false;
			}
			long q=Hn(a,b,k*2+1,l,(l+r)>>1,d>>1)+Hn(a,b,k*2+2,(l+r+1)>>1,r,d>>1);
			dat[k]+=q;
			return q;
		}
		return 0;
	}
	public void Ud3(int a,int b,long d){Hn3(a,b,0,0,m-1,d*m);}
	private Mint Hn3(int a,int b,int k,int l,int r,long d){
		if(k>=cnt){return 0;}
		if(a<=l&&r<=b){dat3[k]=d;dat2[k]=0;bo3[k]=true;return d;}
		if(bo3[k]){
			dat[k]=dat3[k];
			if(2*k+1<cnt){dat3[2*k+1]=dat3[k]/2;bo3[2*k+1]=true;dat2[2*k+1]=0;}
			if(2*k+2<cnt){dat3[2*k+2]=dat3[k]/2;bo3[2*k+2]=true;dat2[2*k+2]=0;}
			bo3[k]=false;
		}
		if(r>=a&&b>=l){
			if((long)dat2[k]!=0){
				if(2*k+1<cnt){dat2[2*k+1]+=dat2[k]/2;}
				if(2*k+2<cnt){dat2[2*k+2]+=dat2[k]/2;}
				dat2[k]=0;
			}
			dat[k]=Hn3(a,b,k*2+1,l,(l+r)>>1,d>>1)+Hn3(a,b,k*2+2,(l+r+1)>>1,r,d>>1);
			return dat[k];
		}
		return dat[k]+dat2[k];
	}
}
public struct Mint{
	const int mod=(int)1e9+7;
	private long d;
	public Mint(long d){this.d=d;}
	public static implicit operator Mint(long d){return new Mint(d%mod);}
	public static explicit operator long(Mint d){return d.d;}
	public override string ToString(){return d.ToString();}
	public static Mint operator+(Mint a,long b){a.d=(a.d+b)%mod;return a;}
	public static Mint operator+(Mint a,Mint b){a.d=(a.d+b.d)%mod;return a;}
	public static Mint operator-(Mint a,long b){a.d=(mod+a.d-b)%mod;return a;}
	public static Mint operator-(Mint a,Mint b){a.d=(mod+a.d-b.d)%mod;return a;}
	public static Mint operator*(Mint a,long b){a.d=(a.d*b)%mod;return a;}
	public static Mint operator*(Mint a,Mint b){a.d=(a.d*b.d)%mod;return a;}
	public static Mint operator/(Mint a,long b){a.d=(a.d*Mi(b))%mod;return a;}
	public static Mint operator/(Mint a,Mint b){a.d=(a.d*Mi(b.d))%mod;return a;}
	private static long Mi(long a){
		a=(a+mod)%mod;
		long b=mod,u=1,v=0;
		while(b>0){
			long t=a/b;
			a-=t*b;a^=b;b^=a;a^=b;
			u-=t*v;u^=v;v^=u;u^=v;
		}
		u%=mod;
		if(u<0){u+=mod;}
		return u%mod;
	}
}
public class Sc{
	public int I{get{return int.Parse(Console.ReadLine());}}
	public long L{get{return long.Parse(Console.ReadLine());}}
	public double D{get{return double.Parse(Console.ReadLine());}}
	public string S{get{return Console.ReadLine();}}
	public int[] Ia{get{return Array.ConvertAll(Console.ReadLine().Split(),int.Parse);}}
	public long[] La{get{return Array.ConvertAll(Console.ReadLine().Split(),long.Parse);}}
	public double[] Da{get{return Array.ConvertAll(Console.ReadLine().Split(),double.Parse);}}
	public string[] Sa{get{return Console.ReadLine().Split();}}
	public object[] Oa{get{return Console.ReadLine().Split();}}
	public int[] Ia2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),int.Parse);}}
	public int[] Ia3(int a){return Array.ConvertAll((a.ToString()+" "+Console.ReadLine()).Split(),int.Parse);}
	public int[] Ia3(bool a,int b,bool c,int d){return Array.ConvertAll(((a?b.ToString()+" ":"")+Console.ReadLine()+(c?" "+d.ToString():"")).Split(),int.Parse);}
	public long[] La2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),long.Parse);}}
	public long[] La3(int a){return Array.ConvertAll((a.ToString()+" "+Console.ReadLine()).Split(),long.Parse);}
	public long[] La3(bool a,int b,bool c,int d){return Array.ConvertAll(((a?b.ToString()+" ":"")+Console.ReadLine()+(c?" "+d.ToString():"")).Split(),long.Parse);}
	public double[] Da2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),double.Parse);}}
	public double[] Da3(int a){return Array.ConvertAll((a.ToString()+" "+Console.ReadLine()).Split(),double.Parse);}
	public double[] Da3(bool a,int b,bool c,int d){return Array.ConvertAll(((a?b.ToString()+" ":"")+Console.ReadLine()+(c?" "+d.ToString():"")).Split(),double.Parse);}
	public T[] Arr<T>(int n,Func<T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f();}return a;}
	public T[] Arr<T>(int n,Func<int,T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(i);}return a;}
	public T[] Arr<T>(int n,Func<string[],T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(Console.ReadLine().Split());}return a;}
	public T[] Arr<T>(int n,Func<int,string[],T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(i,Console.ReadLine().Split());}return a;}
}