import math

line_1 = raw_input()

tokens = line_1.split()
nums = [int(t) for t in tokens]

n = nums[0]
x = nums[1]
y = nums[2]

p = int(math.ceil(n*y/100) - x)
if p < 0:
	p = 0

print p
	 		 			 			  			    	  			   	