/*
 * Solution Template for IGM
 * 
 * Australian Informatics Olympiad 2026
 * 
 * This file is provided to assist with reading of input and writing of output
 * for the problem. You may modify this file however you wish, or
 * you may choose not to use this file at all.
 */

#include <stdio.h>

/* N is the number of delegates. */
int N;
/* A contains the delegates' importance values. The array starts from 0. */
int A[200005];

int main(void) {
  int i;

  /* Read the number of delegates and their importance values. */
  scanf("%d", &N);
  for (i = 0; i < N; i++) {
    scanf("%d", &A[i]);
  }

  /*
   * TODO: Determine whether a valid starting delegate exists. Output YES or
   * NO. An example YES output is shown below.
   */
  printf("YES\n");

  return 0;
}