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

namespace Algorithm
{
    class Program
    {
        static void Main(string[] args)
        {
            var l = Console.ReadLine().Split().Select(int.Parse).ToArray();
            int P = l[0], Q = l[1], A = l[2];

            var min = 0;
            var max = 1000000000;
            var mid = max / 2;

            while (mid > 0)
            {
                var eat = EatStore(P, mid);
                var takeout = TakeOut(Q, mid, A);

                if (eat < takeout)
                {
                    min = mid + 1;
                    mid = (min + max) / 2;
                }
                else
                {
                    max = mid - 1;
                    mid = min + (max - min) / 2;
                }

                if (min == max && min == mid) break;
            }

            Console.WriteLine(max);
        }

        static int EatStore(double p, int x)
        {
            return (int)((1 + (p / 100)) * x);
        }

        static int TakeOut(double q, int x, int a)
        {
            return (int)((1 + q / 100) * x) + a;
        }
    }
}