//package codeforce;
import java.util.*;
import java.io.*;

public class Main {
	
	static class InputReader {
		BufferedReader bin;
		StringTokenizer tokenizer;
		
		public InputReader(InputStream in) {
			bin = new BufferedReader(new InputStreamReader(in));
			tokenizer = null;
		}
		
		public String next() {
			
			while( tokenizer == null || !tokenizer.hasMoreTokens())  {
				try {
					tokenizer = new StringTokenizer(bin.readLine());
				} catch(IOException e) {
					throw new RuntimeException(e);
				}
			}
			return tokenizer.nextToken();
		}
		
		public int nextInt() {
			return Integer.parseInt(next());
		}
		
		public long nextLong() {
			return Long.parseLong(next());
		}
		
		public double nextDouble() {
			return Double.parseDouble(next());
		}
		
		public float nextFloat() {
			return Float.parseFloat(next());
		}
		
		public void close() {
			try {
				bin.close();
				tokenizer = null;
			} catch ( IOException e) {
				throw new RuntimeException(e);
			}
		}
		
	}
	
	public static void main(String[] args) {
		InputReader in = new InputReader(System.in);
		PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));
		
		int numP, numW,numC,per;
		
		numP = in.nextInt();
		numW = in.nextInt();
		per = in.nextInt();
		
		numC = (int)Math.ceil(((double)(per*numP))/100) - numW;
		out.println(numC);
		out.close();
		in.close();
	}
	
}
