import math
  
def main():
	input = raw_input().split()
	n = int(input[0])
	x = int(input[1])
	y = float(input[2])
	p = y / 100
	
	answer = int(math.ceil(n*p) - x)

	if answer < 0:
		return 0
	else:
		return answer

print main()
	 	  	  		    	 		 		 			    		