n,a,p=map(int,raw_input().split())
if p>100:
    r=p*n-100*a
    res=r//100
    if r%100>0:
        res+=1
else:
    r=p*n-100*a
    s=100-p
    res=r//s
    if r%s>0:
        res+=1
if res<0:
    res=0
print(res)

