import java.util.Scanner;

/**
 * Codeforces 13. Problem A
 * 
 * @author Kemelov Gabit
 */
public class ProblemA {

        public static void main(String[] args) {
                ProblemA problem = new ProblemA();
                problem.solve();
        }

        private void solve() {
                Scanner sc = new Scanner(System.in);
                
                float n = sc.nextFloat();
                float x = sc.nextFloat();
                float y = sc.nextFloat();
                
                int a = (int)Math.ceil(n*y/100-x);
                
                System.out.println(a);               
                
        }   

}