#include<bits/stdc++.h>
using namespace std;
#define mp make_pair
#define INF 10000000
#define MOD 1000000007
#define MID ((l+r)/2)
#define HASHMOD 2305843009213693951
#define ll long long
#define ull unsigned long long
#define F first
#define S second
typedef pair<ll, ll> ii;
typedef pair<ii, int> iii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef map<int, int> mii;
#define EPS 1e-6
#define FOR(i,n) for(int i=0;i<((int)(n));i++)
#define FORi(i,a,b) for(int i=((int)(a));i<((int)(b));i++)
#define FOA(v, a) for(auto v : a)
int t, n;
vi a, b;
int main(){
cin>>n;
int dp[n+1];
a.resize(n);
FOR(i,n){
cin>>a[i]>>a[i];
dp[i] = 0;
}
dp[0] = 1;
ll ans=0;
FORi(i,1,n){
FOR(j,i) if(a[j]<a[i]) dp[i] = max(dp[i], 2*dp[j]);
ans += dp[i];
ans %= MOD;
}
cout<<ans<<endl;
}
