p,q,a = map(int,input().split())
ans = 0
c = p-q
if c == 0:
    print(10**9)
    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
    if c < 0:
        ans += 10**7
        if w==0: ans -= 1
    else:
        # cx < w?
        ans += min(10**7,(w+c-1)//c)
print(ans)