using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;
using System.Globalization;

class Program
{
    static int NN => int.Parse(ReadLine());
    static long[] NList => ReadLine().Split().Select(long.Parse).ToArray();

    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var p = NList;
        var (a, b, c) = (p[0], p[1], p[2]);
        var r = Sqrt(b * b - 4 * a * c);
        var x = (-b - r) / a / 2;
        var y = (-b + r) / a / 2;
        var min = Math.Min(x, y);
        var max = Math.Max(x, y);
        var ans = max - min + 1;
        var eq1 = (r * r == b * b - 4 * a * c) && Math.Abs(b + r) % Math.Abs(a * 2) == 0;
        var eq2 = (r * r == b * b - 4 * a * c) && Math.Abs(b - r) % Math.Abs(a * 2) == 0;
        WriteLine(ans - (eq1 ? 1 : 0) - (eq2 ? 1 : 0));
    }
    static long Sqrt(long n)
    {
        var r = (long)Math.Sqrt(n);
        if (r * r > n) return r - 1;
        return r;
    }
}