#include <iostream>
#include <list>
#include <string>
#include <stdio.h>
#include <stdint.h>
using namespace std;
using uint = unsigned int;
using int64 = int64_t;
using uint64 = uint64_t;

int main()
{

  uint N;
  uint K;
  char s0[7999];

  cin >> N >> K;
  cin.ignore(); 
  cin.getline( s0, sizeof( s0 ) );

  const string s1 = s0;
  const uint L = s1.size();
  list<uint> A;
  auto itr = A.begin();
  
  for( uint i = 0 ; i < L ; i++ ){

    if( s1[i] == ' ' ){

      itr++;

    } else {

      *itr = *itr * 10 + ( s1[i] - '0' );
      
    }

  }

  bool b = true;
  itr = A.begin();

  for( uint j = 0 ; j < N ; j++ ){

    b *= ( *itr % ( K + 1 ) != 0 );
    itr++;

  }

  if( b ){

    cout << "YES" << endl;

  } else {

    cout << "NO" << endl;

  }
  
  return 0;
  
}