miting=raw_input()
miting=miting.split()
citizens=int(miting[0])
mags=int(miting[1])
percent=int(miting[2])
must_have=citizens*(percent/100.0)
if must_have>int(must_have):
    must_have=int(must_have)+1
else:
    must_have=int(must_have)
if mags>=must_have:
    print 0
else:
    print must_have-mags