#include <iostream>
#include <fstream>

using namespace std;

int n, i, j, k, nr, d[100000];
bool pr[10000000];
int st, dr, mid;

int main () {

    ifstream fin("prim.in");
    ofstream fout("prim.out");

    fin >> k;   n = k+1;
    for (i = 2; i <= 10000000; i++)
        if (pr[i] == 0)
            for (j = 2; i*j<=10000000; j++)    pr[i*j] = 1;
    i = 2;
    while (n != 0)
    {
        if (pr[i] == 0)
        {   nr++;   d[nr] = i;   n--;   }
        i++;
    }
    for (i = 1; i <= k+1; i++)  cout << d[i];
   fout << d[k+1]*d[k+1];
}