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 int(p)
	 	    		  	     				    	  	 	