require 'prime'
M=1000000007
def fact(n)
	r=1
	(2..n).each{|i|r=r*i%M}
	r
end
def totient(n)
	n.prime_division.reduce(1){|s,e|s*(e[0]-1)*e[0]**(e[1]-1)}
end
n,m=gets.split.map &:to_i
p 2*fact(n-2)*(2..n/m).reduce(0){|s,i|s+totient(i)}%M