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#include <bits/stdc++.h>

using namespace std;

int n, a,b;

vector <set <long long > > seciki;
vector <pair <long long int, long long int>> dane;
set <set <long long> > potezny_set;
long long konkretnie[600005];

long long wynik=1; //zbior pusty
int main () {
    cin>>n;
    seciki.resize(n);
    for (int i=0; i<n; i++) {
        cin>>a>>b;
        dane.push_back(make_pair(a,b));
        konkretnie[a]=i;  }

    if (n==1) {
        cout<<"2";
        return 0; }




    for (int i=0; i<dane.size(); i++) {
            seciki[i].insert(dane[i].first);
           // cout<<dane[i].first<<": "<<dane[i].first<<" ";
            if (i<dane.size()-1) {
                int j=i+1;
                while (dane[i].first+dane[i].second>=dane[j].first && j<dane.size()) {
                    seciki[i].insert(dane[j].first);
                  //  cout<<dane[j].first<<" ";
                    j++;

                }}
            if (i>0) {
                int j=i-1;
                while (dane[i].first-dane[i].second<=dane[j].first && j>0) {
                  //  cout<<dane[j].first<<" ";
                    seciki[i].insert(seciki[j].begin(),seciki[j].end());
                    j--;
                   }
                }

          //  cout<<"\n";


            }
        //  cout<<"\n\n\n\n\n\n\n\n";

//aktualizacja danych
        for (int i=0; i<seciki.size(); i++) {
           for (auto it=seciki[i].begin(); it!=seciki[i].end(); it++) {
                seciki[i].insert(seciki[konkretnie[*it]].begin(),seciki[konkretnie[*it]].end()); }
            }
       // for (int i=seciki.size()-1; i>=0; i--) {
        //   for (auto it=seciki[i].begin(); it!=seciki[i].end(); it++) {
          //      seciki[i].insert(seciki[konkretnie[*it]].begin(),seciki[konkretnie[*it]].end()); }
         //   }

        //for (int i=0; i<seciki.size(); i++) {

         //   cout<<dane[i].first<<":";
          //  for (auto it=seciki[i].begin(); it!=seciki[i].end(); it++)
          //      cout<<*it<<" ";
          //  cout<<endl;
        //}

        for (int i=0; i<seciki.size(); i++)
            potezny_set.insert(seciki[i]);




         long long wynik=1; ;
         for (int i=potezny_set.size(); i>0; i--) {
            wynik*=i;
            wynik=wynik%1000000007;
         } ;
        cout<<wynik;
}