a, b, c = map(int, input().split())
if a < 0:
    a, b, c = -a, -b, -c
L = -b // (2 * a)
l0 = L+1
r0 = L
N = 10 ** 20
l = -N
r = l0
def f(x):
    return a * x * x + b * x + c
while r - l > 1:
    m = (l + r) >> 1
    if f(m) >= 0:
        l = m
    else:
        r = m
ans = l0 - r
l = r0
r = N
while r - l > 1:
    m = (l + r) >> 1
    if f(m) >= 0:
        r = m
    else:
        l = m
ans += l - r0
print(ans)