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

if P-Q <= 0:
    if P == Q and A == 0:
        ans = 0
    elif P == Q:
        ans = 10**9
    else:
        ans = 0
        for i in ragne(1, 10**9):
            Pin = (100+P)*i//100
            Pout = (100+Q)*i//100+A
            if Pin < Pout:
                ans = 10**9-i+1
                break
else:
    x = 100*A//(P-Q)
    ans = max(1, x-1000)-1
    for i in range(max(1, x-1000), min(10**9, x+1000)+1):
        Pin = (100+P)*i//100
        Pout = (100+Q)*i//100+A
        if Pin < Pout:
            ans += 1
print(ans)