#include <bits/stdc++.h>
using namespace std;
int a[100005];
int main()
{
	int n, k;
	cin >> n >> k;
	int r = 0, l = 0;
	for(int i = 1; i <= n; i ++)
	{
		cin >> a[i];
		r = max(r, a[i]);
	}
	int z = 0;
	for(int i = 1; i <= n; i ++)
	{
		if(a[i] == r)
		{
			continue;
		}
		int e = a[i];
		while(e < r)
		{
			e += k;
			z ++;
		}
		if(e != r)
		{
			cout << "NO" << endl;
			return 0;
		}
	}
	cout << "YES" << " " << z << endl;
	return 0;
}