#include <cstdio>

using namespace std;

ifstream f("damesah.in");
ofstream g("damesah.out");

short n;
int nr;
int sol[20];
FILE* f=fopen("damesah.in","r");
FILE* g=fopen("damesah.out","w");
bool diag1[30], diag2[30], lin[20], fol;

void bkt(int k)
{
    int i;
    if (k == n+1)
    {
        if (fol == 0)
            for (fol = 1, i = 1; i <= n; i++)
                g << sol[i] << " ";
        nr++;
    }
    else
    {
        for (i = 1; i <= n; i++)
        if (diag1[n-k+i] == 0 && diag2[k+i-1] == 0 && lin[i] == 0)
        {
            diag1[n-k+i] = diag2[k+i-1] = lin[i] = 1;
            sol[k] = i;
            bkt(k+1);
            diag1[n-k+i] = diag2[k+i-1] = lin[i] = 0;
        }
    }
}

int main()
{

    bkt(1);
    g << "\n" << nr;
    return 0;
}