P,Q,A=map(int,input().split())
ans = int()
if P == Q:
    ans = 0
elif P < Q:
    ans = 10**9
else:
    x = int(100*A/(P-Q))
    ans = max(0,x-101)
    for i in range(max(1,x-100),x+100):
        if int(i*P/100)-int(i*Q/100) < A:
            ans += 1
print(ans)