import java.util.ArrayList;
import java.util.Arrays;
import java.util.Scanner;

/**
 *pechenki
 */
public class Code {
    public static void main(String [] args) {

        Scanner input = new Scanner(System.in);
        int naselenie = input.nextInt();
        int volwebniki = input.nextInt();
        int percent = input.nextInt();
        int more = 0;
        if(percent<101){
            if(naselenie*percent/100.0 <= volwebniki)
                System.out.println(0);
            else {
                more = (int)Math.ceil(naselenie * percent / 100.0 - volwebniki);
                System.out.println(more);
            }
        }
        else {
            int times = percent/100;
            percent = percent % 100;

            if(naselenie*percent/100 <= volwebniki)
                more = 0;
            else
                more = (int)Math.ceil(naselenie*percent/100.0-volwebniki);
            System.out.println(times*naselenie+more);
        }

    }
}
