P, Q, A = map(int, input().split())
P += 100
Q += 100


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


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

if P > Q:
    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 = (P*x // 100) - (Q*x // 100)
        if d < A:
            ok += 1
        elif d >= A+1:
            break

    print(ok)

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

    print(ans)