#include #define rep(i,n) for (int i = 0; i < n; ++i) #define ALL(c) (c).begin(), (c).end() #define SUM(x) std::accumulate(ALL(x), 0LL) #define MIN(v) *std::min_element(v.begin(), v.end()) #define MAX(v) *std::max_element(v.begin(), v.end()) #define EXIST(v, x) (std::find(v.begin(), v.end(), x) != v.end()) using namespace std; using ll = long long; template inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; } template inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; } const int INF = 1e9; const long long INFL = 1LL<<60; vector create_eratos(int n) { vector isprime(n+1, 1); isprime[0] = 0; isprime[1] = 0; for (int i = 2; i * i <= n; i++) { if (isprime[i]) { int j = i + i; while (j <= n) { isprime[j] = 0; j = j + i; } } } return isprime; } vector createPrimeList(int n) { vector eratos = create_eratos(n); vector result; result.reserve(n); for (int i = 1; i <=n; i++) { if (eratos[i]) { result.push_back(i); } } return result; } int main() { cin.tie(0); ios::sync_with_stdio(false); int n; cin >> n; auto primes = createPrimeList(1e+6); vector ans; ans.push_back(1); for (int v : primes) { if (v <= 1e5) continue; ans.push_back(v * v); } cout << ans[n-1] << endl; return 0; }