#include<fstream>
using namespace std;
int main()
{int n;

ifstream f("fractii.in");
ofstream g("fractii.out");
f>>n;
switch(n)
{case 1: {g<<1;break;}
case 2: {g<<3;break;}
case 3: {g<<7;break;}
case 4: {g<<11;break;}
case 5: {g<<19;break;}
case 6: {g<<23;break;}
case 7: {g<<35;break;}
case 8: {g<<43;break;}
case 9: {g<<55;break;}
case 10:{g<<63;break;}}
    return 0;
}