# Here your code !

require "mathn"

OPERATORS=[ "+", "\\-", "*", "/", "_" ]

EXPRESSIONS=%w[
  AxByCzD    ((AxB)yC)zD    (AxB)y(CzD)    
  (Ax(ByC))zD    Ax((ByC)zD)    Ax(By(CzD))
]

def solve( *nums0 )
  nums0.permutation(nums0.size) do |nums|
    OPERATORS.repeated_permutation(nums0.length-1).each do |ops|
      EXPRESSIONS.each do |exp|
        begin
          yield eval(exp.tr( "ABCDxyz", (nums+ops).join ))
        rescue SyntaxError, ZeroDivisionError
        end
      end
    end
  end
end

n = gets.to_i
a = gets.split.map{|m|m.to_i}

S = 1 << n
flag = false
S.times do |bit|
    x = []
    y = []
    c = 0
    d = 0
    n.times do |s|
        if (bit >> s).to_i % 2 == 0
            x.push(a[s])
            c += 1
        else
            y.push(a[s])
            d += 1;
        end
    end
    if c > 0 and d > 0
        if !(enum_for(:solve, x).to_a - enum_for(:solve, y).to_a).empty? and !flag
            puts("YES")
            flag = true
        end
    end
end

if !flag
    puts("NO")
end