p,q,a=map(int,input().split())
if a==0:
  print([0,10**9][p<q])
  exit()
if p<=q:
  print(10**9)
  exit()
ok=0
for m in range(1,2000000):
  ok+=(100+p)*m//100<(100+q)*m//100+a
print(ok)