#include <iostream>
#include <fstream>
using namespace std;
int main()
{
    ifstream fin("farfurii.in");
    ofstream fout("farfurii.out");
    int n,m,k,i;
    long long t;
    fin>>n>>k;
    m=1;
    while((m*(m-1))/2<k)
        m++;
    cout<<m;
    t=(m*(m-1))/2-k;
    for (i=1;i<=n-m;++i)
          fout<<i<<" ";
    if(t>0)
        fout<<n-t<<" ";
    for(i=n;i>=n-m+1;--i)
    {
        if (i!=n-t)
            fout<<i<<" ";
        else
        if(t==0)
            fout<<i<<" ";
    }
    return 0;
}