#include<bits/stdc++.h>
using namespace std;
int main(){
  int i,j,n,k,m=0;
  int a[100]={0};
  cin>>n>>k;
  k=k-1;
  for(i=0;i<n;i++) cin>>a[i];
  for(i=0;i<n-1;i++)
  	for(j=0;j<n-i-1;j++)
  		if(a[j]<a[j+1]) swap(a[j],a[j+1]);
  m=a[k]-a[n-k-1];
  if(m%2==0||m%3==0||m%5==0||m%7==0&&m!=2&&m!=3&&m!=5&&m!=7) cout<<"YES"<<endl;
  else cout<<"NO"<<endl;                                                                                                                                                                         
  cout<<m;
return 0;
}
/**************************************************************
	Problem: 1242
	User: wtq001
	Language: C++
	Result: Wrong Answer
****************************************************************/