import java.util.Scanner;
public class wizards {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        float n = input.nextFloat();
        float x = input.nextFloat();
        float y = input.nextFloat()/100;
        int puppets = 0;
        while (x/n < y){
            x += 1;
            puppets += 1;
        }
        System.out.println(puppets);
    }
}