p, q, a=map(int, input().split())
if p<q or (p==q and a>0):
    print(10**9)
elif p==q and a==0:
    print(0)
else:
    MAX=(a+1)*100//(p-q)
    ans=0
    for x in range(1, MAX+1):
        if p*x//100 < q*x//100+a:
            ans+=1
    print(ans)