var GET=(function(){function f(s){return new g(s);}function g(s){this._s=s.trim().split("\n");this._y=0;}g.prototype.a=function(f){var s=this._s, y=this._y, r;if(typeof s[y]==="string")s[y]=s[y].split(" ").reverse();r=s[y].pop();if(!s[y].length)this._y++;return f?r:+r;};g.prototype.l=function(f){var s=this._s[this._y++].split(" ");return f?s:s.map(a=>+a);};g.prototype.m=function(n,f){var r=this._s.slice(this._y,this._y+=n).map(a=>a.split(" "));return f?r:r.map(a=>a.map(a=>+a));};g.prototype.r=function(n,f){var r=this._s.slice(this._y,this._y+=n);return f?r:r.map(a=>+a);};return f;})();
var o=GET(require("fs").readFileSync("/dev/stdin","utf8"));
function xArray(v){var a=arguments,l=a.length,r="Array(a["+--l+"]).fill(0).map(x=>{return "+v+";})";while(--l)r="Array(a["+l+"]).fill(0).map(x=>"+r+")";return eval(r);}
var mod = 1e9+7;
function modinv(a){for(var b=mod,u=1,v=0,t;b;v=t)t=a/b|0,a-=t*b,u-=t*v,t=a,a=b,b=t,t=u,u=v;u%=mod;return u<0?u+mod:u;}
function abmod(){for(var a=arguments,r=a[0],i=1;i<a.length;)r=((r>>16)*a[i]%mod*65536+(r&65535)*a[i++])%mod;return r;}
function inv(a){
  var n = a.length;
  var m = 0;
  for(var i = 1; i < n; i <<= 1){
    var b = [];
    for(var j = 0; j < n;){
      var l = j, r = Math.min(n,l+i), l2 = r, r2 = Math.min(n,r+i);
      while(j < r2){
        if(l === l2)b[j]=a[r++];
        else if(r === r2)b[j]=a[l++];
        else if(a[l] > a[r]){m+=l2-l;b[j]=a[r++];}
        else b[j]=a[l++];
        j++;
      }
    }
    a = b;
  }
  return m;
}

console.log(main());
function main(){
  var n = o.a();
  var k = o.a();
  var a = o.l();
  var ans = inv(a);
  ans = abmod(ans,k);
  a.sort((a,b)=>b-a);
  var b = inv(a);
  ans += abmod(b,k-1,k,modinv(2));
  return ans%mod;
}