using System;
using System.Collections.Generic;
using System.Linq;

namespace Truck_Tour
{
    class Pump
    {
        public Pump()
        {

        }// Pump()

        public Pump(int newNum, int newFuel, int newDistanceToNextPump)
        {
            this.Num = newNum;
            this.Fuel = newFuel;
            this.DistanceToNextPump = newDistanceToNextPump;
        }

        public int Num { get; set; }
        public int Fuel { get; set; }
        public int DistanceToNextPump { get; set; }
    }// class Pump

    class TruckTour
    {
        static void Main(string[] args)
        {
            Queue<Pump> pumps = new Queue<Pump>();

            int n = int.Parse(Console.ReadLine());

            for (int i = 0; i < n; i++)
            {
                int[] input = Console.ReadLine().Split(' ', StringSplitOptions.RemoveEmptyEntries).Select(int.Parse).ToArray();

                int fuel = input[0];
                int distance = input[1];

                Pump pump = new Pump(i, fuel, distance);
                pumps.Enqueue(pump);
            }

            int countOfPump = 0;
            int currentStartIndex = -1;
            int currentFuel = 0;
            int noPumps = 0;

            while ((countOfPump < n) && (noPumps < 2 * n))
            {
                Pump pump = pumps.Dequeue();
                pumps.Enqueue(pump);
                noPumps++;

                currentFuel += pump.Fuel;

                if (currentFuel >= pump.DistanceToNextPump)
                {
                    countOfPump++;
                    currentFuel -= pump.DistanceToNextPump;
                    if (currentStartIndex.Equals(-1))
                    {
                        currentStartIndex = pump.Num;
                    }
                }
                else
                {
                    countOfPump = 0;
                    currentFuel = 0;
                    currentStartIndex = -1;
                }
            }
            if (noPumps < 2 * n)
            {
                Console.WriteLine(currentStartIndex);
            }
            else
            {
                Console.WriteLine("No");
            }

        }
    }
}