using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var L = NN;
        var map = NArr(L);
        var mod = 1_000_000_007;
        var ans = 1L;
        for (var i = 0; i < L; ++i)
        {
            var p = (long)map[i][0];
            var e = (long)map[i][1];
            var rp = Exp(p - 1, mod - 2, mod);
            ans = ans * (Exp(p, e + 2, mod) - p * (e + 2) % mod + e + 1 + mod) % mod * rp % mod * rp % mod;
        }
        WriteLine(ans);
    }
    static long Exp(long n, long p, int mod)
    {
        long _n = n % mod;
        var _p = p;
        var result = 1L;
        if ((_p & 1) == 1) result *= _n;
        while (_p > 0)
        {
            _n = _n * _n % mod;
            _p >>= 1;
            if ((_p & 1) == 1) result = result * _n % mod;
        }
        return result;
    }
}