P, Q, A = map(int, input().split())


def solve(x):
    return (100+P)*x // 100 < (100+Q)*x // 100 + A-1


if P < Q:
    print(10**9)
    exit()
if A == 0:
    print(0 if P >= Q else 10**9)
    exit()

ok, ng = 0, 10**9+1
while ng - ok > 1:
    mid = (ok+ng)//2
    if solve(mid):
        ok = mid
    else:
        ng = mid

for x in range(ok+1, 10**9+1):
    d = ((100+P)*x // 100) - ((100+Q)*x // 100)
    if d < A:
        ok += 1
    if d >= A+1:
        break

print(ok)