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

def func1(l,r):
    if l == r:
        return l
    a = (l+r+1)//2
    if (a*P/100)//1 - (a*Q/100+A)//1 < -1:
        return func1(a,r)
    else:
        return func1(l,a-1)
def func2(l,r):
    if l == r:
        return l
    a = (l+r+1)//2
    if (a*P/100)//1 - (a*Q/100+A)//1 > 1:
        return func2(l,a-1)
    else:
        return func2(a,r)
ans = func1(0,10**9)

for i in range(ans+1,func2(0,10**9)):
    if (i*P)//100 < (i*Q)//100 + A:
        ans += 1
if P <= Q:
    print(0)
    exit()

print(ans)