P, Q, A = map(int, input().split())
if P < Q:
    print(10 ** 9)
    exit()
elif P == Q:
    if A:
        print(10 ** 9)
    else:
        print(0)
    exit()
    
def f(n, p, a):
    return (100 + p) * n//100 + a
    
ans = 0
for i in range(1, 10 ** 7):
    if f(i, P, 0) < f(i, Q, A):
        ans += 1
print(ans)