p,q,a = map(int,input().split())
ans = 0
c = p-q
if c < 0:
    print(10**9)
    exit()
elif c==0:
    print(10**9 if a else 0)
    exit()
for i in range(1,101):
    v = (100+p)*i//100
    w = (100+q)*i//100
    # (p-q)x < w+a-v? (for 0 <= x < 10**7)
    w += a-v
    # cx < w?
    ans += min(10**7,(w+c-1)//c)
print(ans)