p,q,a = map(int,input().split())

ans = 0
def check(x):

    eatin = (100+p)*x//100
    takeout = a + (100+q)*x//100
    return eatin < takeout

for i in range(1,10**6+1):
    ans += check(i)

if check(10**9):
    ans += 10**9-10**6

print(ans)