static void Main(string[] args)
{
int n = KyoproLibrary.ReadInteger();
int[,] points = KyoproLibrary.ReadIntegerPairArray(n);
double max_distance = 0;
for (int i = 0; i < n - 1; i++)
{
for (int j = i + 1; j < n; j++)
{
double distance = DistSqrd(points[i, 0], points[i, 1], points[j, 0], points[j, 1]);
if (distance > max_distance)
{
max_distance = distance;
}
}
}
Console.WriteLine(Math.Sqrt(max_distance));
Console.ReadLine();
}
static double DistSqrd(int x, int y, int _x, int _y)
{
return(KyoproLibrary.FastPower(x - _x, 2) + KyoproLibrary.FastPower(y - _y, 2));
}