#include <iostream>
using namespace std;

//誤差を求める
long long error(int mean,int n) {
	long long total_error = 0;
	for (int i = 0;i < n;i++) {
		int num; cin >> num;
		total_error += num - mean;
	}
	return total_error;
}

int main(void) {
	int n; cin >> n; //数列の要素数
	int a; cin >> a; //手計算の結果
	switch (error(a,n)) {
		case 0:
			cout << "YES" << endl;
			break;
		default:
			cout << "NO" << endl;
	}
}