 import java.util.Scanner;
 
 public class Main {
 
     public static void main (String[] args) throws Exception{

  //   int n;
  //   int k;
  //   int y;
     int i = 0;
     int clonecount = 0;
     boolean end = false;
  //   int[] arrayone = new int[3];
    
     Scanner input = new Scanner(System.in);
     int n = input.nextInt();
     int k = input.nextInt();
     int y = input.nextInt();
//     arrayone[0] = n;
 //    arrayone[1] = k;
  //   arrayone[2] = y;
    
    
     while (!end) { 
     float percent = (((float)n / (float)k) * 100); 
     if (percent < y) {  
     n += 1;
     clonecount ++;
 //    System.out.println(percent);
 //    System.out.println(clonecount);
     }
     else if (percent >= y) 
     { end = true; 
     }
     else {
     System.out.print("boo");
     }
    
     }
     System.out.println(clonecount);
    	 
     
 /*    for (i=0; i<3; ++i) 
     {
     System.out.println(arrayone[i]);
     } */
     
    
     
     }
     
}
  	   			 		 	  	 			   		 	  	