p,q,a = map(int,input().split()) ans = 0 c = p-q if c < 0: print(10**9) exit() elif c==0: print(10**9 if a else 0) exit() for i in range(1,101): v = (100+p)*i//100 w = (100+q)*i//100 # (p-q)x < w+a-v? (for 0 <= x < 10**7) w += a-v # cx < w? ans += min(10**7,(w+c-1)//c) print(ans)