from math import floor

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

if P <= Q:
    print(0)
    exit()

ans = 0
for mod in range(100):
    p = floor(P*mod/100)
    q = floor(Q*mod/100)
    k = (q - p + A) / (P - Q)
    if mod != 0:
        if floor(k) == k:
            ans += floor(k)
        else:
            ans += floor(k) + 1
    else:
        if floor(k) == k:
            ans += floor(k) - 1
        else:
            ans += floor(k)

print(ans)