p, q, a = map(int, input().strip().split())
mx = 1000000000
if int((1+p/100)*mx) < int((1+q/100)*mx)+a:
    print(mx)
else:
    print(sum(1 for x in range(1, 200*a) if int((1+p/100)*x) < int((1+q/100)*x)+a))