A, B, C = map(int, input().split())
if A > 0:
    ans = 0
    for i in range(-4000000, 4000001):
        if A * i * i + B * i + C < 0:
            ans += 1
    print(ans)
else:
    ans = 0
    for i in range(-4000000, 4000000):
        if A * i * i + B * i + C > 0:
            ans += 1
    print(ans)