import sys
sys.setrecursionlimit(1000000000)

#
# Solution Template for Soccer Match
# 
# Australian Informatics Olympiad 2025
# 
# 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.
#

# N is the number of goals.
N = 0

# G contains the goals. Note that the list starts from 0, and so the values are
# G[0] to G[N-1].
G = []

# Read the value of N and the sequence of goals.

N = int(input().strip())
G = list(map(int, input().strip().split()))

# TODO: This is where you should compute your solution. You should output YES
# or NO depending on whether there was any point during the game where Team 1
# had more goals than Team 2. An example of how to output YES is shown below.

print("YES")