#include <stdio.h>

int main(void) {
  int n, ave;
  scanf("%d", &n);
  scanf("%d", &ave);

  int data;
  double ans;
  double sum = 0;
  int i;
  for (i = 0; i < n; i++) {
	scanf("%d", &data);
	sum += data;
  }
  ans = sum / n;

  printf("%f\n", ans);
  if (ans == ave) {
	printf("YES\n");
  } else {
	printf("NO\n");
  }

  return 0;
}