code

#include "stdio.h"
#include "stdlib.h"
#include <iostream>
#include <set>
#include <math.h>
#pragma warning(disable : 4996)

using namespace std;

int main()
{
	set<unsigned long long int> s;
	unsigned long long int i, j, a, b, k, count = 0, d[500000], nd = 0;
	cin >> k;
	for (i = 1; i <= (unsigned long long int)sqrt(k); i++)
	{
		if (k % i == 0)
		{
			d[nd] = i;
			nd++;
			d[nd] = k / i;
			nd++;
		}

	}
	for (i = 0; i < nd; i++)
	for (j = 0; j <= i; j++)
	{
		if ((k * k) % d[i] * d[j] == 0)
		{
			s.insert(d[i] * d[j]);
		}
	}
	cout << s.size() << endl;
	for (set<unsigned long long int>::const_iterator it = s.begin(); it != s.end(); it++) {
		cout << k + (*it) << " " << k * k / (*it) + k << endl;
	}
	return 0;
}