import java.util.*;
import java.io.*;
import java.math.BigDecimal;
    public class Main
    {
        public static void main(String[] args)
        {
        Scanner sc =new Scanner(System.in);    
        int a=sc.nextInt();int b=sc.nextInt();
        int c=sc.nextInt();
        double lol=(double)c/100*a;
        if(lol!=(int)lol){lol=(int)lol +1;}
        int loh=(int)lol;
        System.out.println(loh-b);
    }
    }