import math
P,Q,A = map(int,input().split())

def test(mid,A):
    return math.floor(((100+P)/100) * mid) >= math.floor(((100+Q)/100) * mid) + A

left = 0
right = 10**9
while left+1 < right:
    mid = (left+right)//2
    if test(mid,A):
        right = mid
    else:
        left = mid
answer = right
print(answer-1)