public override void Solve(IOManager io)
{
var n = io.ReadInt();
long count = 0;
var eratos = new Eratosthenes(n);
for (int c = 1; c < n; c++)
{
var remain = n - c;
var divs = eratos.GetDivisiors(remain);
count += divs.Count();
}
io.WriteLine(count);
}
public void GetDivisiorsTest(int n, params int[] divisiors)
{
Assert.Equal(divisiors, _eratosthenes.GetDivisiors(n).OrderBy(i => i));
}