#include <fstream>
using namespace std;
ifstream f("prim.in");
ofstream g("prim.out");
int k,nr,i,nd,d,ok,j,v[10001];
int main()
{   f>>k;
    nr=1;
    i=2;
    while (nr<=k) {
        nd=0;
        for (d=2;d<=i/2;++d) {
            if (i%d==0) ++nd;break;}
        if (nd==0) {v[nr]=i;++nr;}
        ++i;
        }
    j=2;
    while (1==1) {
        ok=0;
        for (i=1;i<=k;++i) {
            if (j%v[i]==0) {++ok;break;}}
        if (ok==0) {
            nd=0;
            for (d=2;d<=j/2;++d) {
                if (j%d==0) {++nd;break;}}
            if(nd!=0) {g<<j<<'\n';break;}

        }
        ++j;
    }
    return 0;
}