//g++ 4.cpp -std=c++14 -O2 -I .
#include <bits/stdc++.h>
using namespace std;

#include <atcoder/all>
using namespace atcoder;

using ll = long long;
using ld = long double;

using vi = vector<int>;
using vvi = vector<vi>;
using vll = vector<ll>;
using vvll = vector<vll>;
using vld = vector<ld>;
using vvld = vector<vld>;

#define fi first
#define se second
#define pb push_back
#define all(a) a.begin(),a.end()
#define rep(i,start,end) for(ll i=start;i<(ll)(end);i++)
#define per(i,start,end) for(ll i=start;i>=(ll)(end);i--)

constexpr int inf = 500000;

int main(){
  ios::sync_with_stdio(false);
  cin.tie(nullptr);

  vi ans(10);
  ans[0]=7,ans[1]=11,ans[2]=13,ans[3]=17,ans[4]=19,ans[5]=23;
  ans[6]=29,ans[7]=47,ans[8]=59,ans[9]=61;

  int n;
  cin>>n;
  cout<<ans[n-1]<<endl;
}