M=10**9+7
n,m=gets.split.map &:to_i;r=0;s=[*0..n/m]
(2..n/m).each{|i|s[i]==i&&i.step(n/m,i){|j|s[j]=s[j]/j*~-j};r+=s[i]}
r*=2;(2..n-2).each{|i|r=r*i%M}
p r%M