p,q,a=map(int,input().split())
if a==0 and p==q:
    cnt=0
else:
    if p<=q:
        cnt=10**9
        for i in range(1,10**7):
            eatin=i+(i*p)//100
            takeout=i+(i*q)//100+a
            if eatin>=takeout:
                cnt-=1
    elif p>q:
        cnt=0
        for i in range(1,10**7):
            eatin=i+(i*p)//100
            takeout=i+(i*q)//100+a
            if eatin<takeout:
                cnt+=1
print(cnt)