P, Q, A = map(int, input().split())
cnt = 0
INF = 2 * 10 ** 6
for x in range(1,  INF + 1):
    if (x * P) // 100 < (x * Q) // 100 + A:
        cnt += 1
if cnt == INF:
    print(10 ** 9)
else:
    print(cnt)