import sys
from math import *
s=""
s=[x.replace("\n",'') for x in sys.stdin.readlines()]
n=int(s[0].split()[0])
x=int(s[0].split()[1])
y=int(s[0].split()[2])
if n*(y/100.0)<=x:
	print 0
else:
	t=int(ceil(n*(y/100.0)-x))
	print t
	
