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

namespace AtCoder.Contest.B
{
	static class Program
	{
		public static void Main(string[] args)
		{
			var sw = new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false };
			Console.SetOut(sw);

			var cin = new Scanner();

			int p = cin.NextInt();
			int q = cin.NextInt();
			int a = cin.NextInt();
			if (p <= q && a != 0) Console.WriteLine(1000000000);
			else if (a > 0)
			{
				long ans = 0;
				if (a > 0)
				{
					for (int i = 1; i <= 100 * (a + 1) / (p - q); i++)
					{
						if (Math.Floor((1.0m + q / 100.0m) * i) + a > Math.Floor((1.0m + p / 100.0m) * i))
						{
							ans++;
						}
					}
				}
				Console.WriteLine(ans);
			}
            else if (p >= q) Console.WriteLine(0);
			else
			{
				long ans = 1000000000;
				for (int i = 1; i <= 100; i++)
				{
					if (Math.Floor((1.0 + q / 100.0) * i) + a <= Math.Floor((1.0 + p / 100.0) * i))
					{
						ans--;
					}
				}
                Console.WriteLine(ans);
			}

			Console.Out.Flush();
		}
	}

	class Scanner
	{
		string[] s;
		int i;

		char[] cs = new char[] { ' ' };

		public Scanner()
		{
			s = new string[0];
			i = 0;
		}

		public string Next()
		{
			if (i < s.Length) return s[i++];
			string st = Console.ReadLine();
			while (st == "") st = Console.ReadLine();
			s = st.Split(cs, StringSplitOptions.RemoveEmptyEntries);
			if (s.Length == 0) return Next();
			i = 0;
			return s[i++];
		}

		public int NextInt()
		{
			return int.Parse(Next());
		}

		public int[] ArrayInt(int N, int add = 0)
		{
			int[] Array = new int[N];
			for (int i = 0; i < N; i++)
			{
				Array[i] = NextInt() + add;
			}
			return Array;
		}

		public long NextLong()
		{
			return long.Parse(Next());
		}

		public long[] ArrayLong(int N, long add = 0)
		{
			long[] Array = new long[N];
			for (int i = 0; i < N; i++)
			{
				Array[i] = NextLong() + add;
			}
			return Array;
		}

		public double NextDouble()
		{
			return double.Parse(Next());
		}

		public double[] ArrayDouble(int N, double add = 0)
		{
			double[] Array = new double[N];
			for (int i = 0; i < N; i++)
			{
				Array[i] = NextDouble() + add;
			}
			return Array;
		}
	}
}