//g++ 1.cpp -std=c++14 -O2 -I .
#include <bits/stdc++.h>
using namespace std;

#include <atcoder/all>
using namespace atcoder;

using ll = long long;
using ld = long double;

using vi = vector<int>;
using vvi = vector<vi>;
using vll = vector<ll>;
using vvll = vector<vll>;
using vld = vector<ld>;
using vvld = vector<vld>;
using vst = vector<string>;
using vvst = vector<vst>;

#define fi first
#define se second
#define pb push_back
#define eb emplace_back
#define pq_big(T) priority_queue<T,vector<T>,less<T>>
#define pq_small(T) priority_queue<T,vector<T>,greater<T>>
#define all(a) a.begin(),a.end()
#define rep(i,start,end) for(ll i=start;i<(ll)(end);i++)
#define per(i,start,end) for(ll i=start;i>=(ll)(end);i--)
#define uniq(a) sort(all(a));a.erase(unique(all(a)),a.end())

constexpr ll mod = 1e9+7;

int main(){
  ios::sync_with_stdio(false);
  cin.tie(nullptr);

  int l;
  cin>>l;

  ll ans=1;
  rep(i,0,l){
    ll p,e;
    cin>>p>>e;

    ll now=0;
    now+=pow_mod(p,e+1,mod)-1;
    now*=pow_mod(p-1,mod-2,mod);
    now%=mod;
    now*=p;
    now-=e+1;
    now=now%mod+mod;
    now*=pow_mod(p-1,mod-2,mod);
    now%=mod;

    ans*=now;
    ans%=mod;
  }

  cout<<ans<<endl;
}