import math
p, q, a = map(int, input().split())

ok = 0
ng = 10**9+1
mid = (ok+ng) // 2
while ng - ok > 1:
    if math.floor((1 + p/100) * mid) < math.floor((1+q/100) * mid) + a:
        ok = mid
    else:
        ng = mid
    mid = (ok+ng) // 2

ans = ok+200
for i in range(max(1, ok-200), ok+201):
    if math.floor((1 + p/100) * i) >= math.floor((1+q/100) * i) + a:
        ans -= 1

print(ans)