#include <bits/stdc++.h>
using namespace std;

//--------------------------------------------
#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define RFOR(i,a,b) for(int i=(b)-1;i>=(a);i--)
#define REP(i,n) FOR(i,0,n)
#define RREP(i,n) RFOR(i,0,n)
#define LL long long
#define INF INT_MAX/3

//--------------------------------------------
const double EPS = 1e-14;
const double PI  = acos(-1.0);

//--------------------------------------------

int main(){
  int n,a;
  int x[10];

  scanf("%d %d",&n,&a);
  REP (i, n) scanf("%d",&x[i]);

  double sum = 0;
  REP (i, n) sum += double(x[i]);
  sum = sum / double(n);

  if (sum == a) printf("YES\n");
  else printf("NO\n");
}