#include<bits/stdc++.h>
using namespace std;
inline int read()
{
	int f=1,num=0;
	char c=getchar();
	while(c<'0'||c>'9'){if(c=='-') f=-1;c=getchar();}
	while(c>='0'&&c<='9') num=num*10+c-'0',c=getchar();
	return num*f;
}
const int N=100010,MOD=1e9+7;
pair<int,int> p[N];
int n;
int ans;
void dfs(int c,int r,int sum)
{
	if(c>n){ans+=sum;return;}
	dfs(c+1,r,sum);
	if(p[c].first>r) dfs(c+1,p[c].second,sum+1);
	else dfs(c+1,max(r,p[c].second),sum);
	return;
}
int main()
{
	freopen("usaco_Feb_help.in","r",stdin);
	freopen("usaco_Feb_help.out","w",stdout);
	n=read();
	for(int i=1;i<=n;i++) p[i].first=read(),p[i].second=read();
	sort(p+1,p+1+n);
	dfs(1,0,0);
	printf("%d",ans%MOD);
	return 0;
}