#include <stdio.h>

int main () {
  int n = 0;
  int m = 0;
  int l = 0;
  int a = 0;
  
  int res = 0;
  
  int ans[1001] = {};
  
  res = scanf("%d", &n);
  res = scanf("%d", &m);
  res = scanf("%d", &l);
  ans[l] = 1;
  for (int i = 0; i < n; i++) {
    res = scanf("%d", &a);
    for (int j = a+1; j <= 1000; j++) {
      if (ans[j] > 0) {
        ans[(j+a)/2] = 1;
      }
    }
    for (int j = a-1; j > 0; j--) {
      if (ans[j] > 0) {
        ans[(j+a)/2] = 1;
      }
    }
  }
  
  if (ans[m] > 0) {
    printf("Yes\n");
  } else {
    printf("No\n");
  }
  
  return 0;
}