#coding:utf-8
#! usr/bin/env python
import math

nxy=raw_input()
n=int(nxy.split(' ')[0])
x=int(nxy.split(' ')[1])
y=int(nxy.split(' ')[2])

if 1.0*(x)/n>100*y:
    print 0
elif y>=100:
    print int(math.ceil(1.0*(y*n-100*x)/(100-y)+1))
else:
    print int(math.ceil(1.0*(y*n-100*x)/(y-100)+1))