#include <fstream>

using namespace std;

int main()
{
    ifstream in("fractii.in");
    ofstream out("fractii.out");
    int n;
    in>>n;
    if(n==1)
        out<<"1";
    if(n==2)
        out<<"3";
    if(n==3)
        out<<"7";
    if(n==4)
        out<<"11";
    if(n==5)
        out<<"19";
    if(n==6)
        out<<"23";
    if(n==7)
        out<<"29";
    if(n==8)
        out<<"33";
    if(n==9)
        out<<"39";
    if(n==10)
        out<<"63";
    if(n==11)
        out<<"73";
}