# (´；ω；｀)

require 'matrix'

def cross(u,v)
    return v[0]*u[1]-u[0]*v[1];
end

def calc(v)
    5.times{|i|
        d1=cross(v[(i+1)%5]-v[i],v[(i+2)%5]-v[i])
        d2=cross(v[(i+1)%5]-v[i],v[(i+3)%5]-v[i])
        d3=cross(v[(i+1)%5]-v[i],v[(i+4)%5]-v[i])
        return false if d1*d2>=0 || d2*d3>=0
    }
    return true
end

point=[]
5.times{
    point << Vector.elements(gets.split.map(&:to_i))
}


point.permutation{|v|
    if calc(v)
        puts "YES";exit
    end
}	

puts "NO"