n,k=gets.split.map &:to_i
a=gets.split.map(&:to_i).sort
q=1
m=10**9+7
b=[]
a.each_slice(2){|x,y|
    q=0 if x+y>k
    i=b.bsearch_index{|z|x+z>k}||b.size
    j=b.bsearch_index{|z|y+z>k}||b.size
    q+=i*j-[i,j].min
    b<<x<<y
    q%=m
}
p q