#nullable enable

#region
var (_input, _iter) = (Array.Empty<string>(), 0);
T I<T>() where T : IParsable<T>
{
    while (_iter >= _input.Length) (_input, _iter) = (Console.ReadLine()!.Split(' '), 0);
    return T.Parse(_input[_iter++], null);
}
#endregion

decimal e = 1;
for (var i = 0; i < 12; i++) e /= 10;

decimal Sqrt(decimal x)
{
    decimal l = 0;
    decimal r = 1000000000001;
    for (var i = 0; i < 160; i++)
    {
        var mid = (l + r) / 2;
        if (mid * mid <= x) l = mid;
        else r = mid;
    }
    return l;
}

var a = I<decimal>();
var b = I<decimal>();
var c = I<decimal>();
if (a < 0) (a, b, c) = (-a, -b, -c);

var d = b * b - a * c * 4;
var sqrtd = Sqrt(d);
var dx1 = (-b - sqrtd) / (a * 2);
var dx2 = (-b + sqrtd) / (a * 2);
var x1 = (long)Math.Ceiling(dx1 + e);
var x2 = (long)Math.Floor(dx2 - e);
var ans = x2 - x1 + 1;
if (ans < 0) ans = 0;
Console.WriteLine(ans);