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- #define _CRT_SECURE_NO_WARNINGS
- #pragma GCC Optimize("Ofast")
- #include <string.h>
- #include <iostream>
- #include <vector>
- #include <set>
- #include <chrono>
- #include <string>
- #include <time.h>
- #include <unordered_set>
- #include <iomanip>
- #include <cmath>
- #include <map>
- #include <queue>
- #include <numeric>
- #include <unordered_map>
- #include <algorithm>
- #include <fstream>
- #include <sstream>
- #include <cstddef>
- #include <cstdio>
- #include <iostream>
- #include <memory>
- #include <stdexcept>
- #include <string>
- #include <cmath>
- #include <complex>
- #include <array>
- using namespace std;
- typedef long long ll;
- const int maxn = 1e2 + 14, lg = 15;
- const int BASE = 3e3;
- int64_t count_ops = 0;
- const double PI = acos(-1);
- typedef complex<double> base;
- double SIN[1000000];
- #define MAXN 10000000
- void fft(vector<base>& a, bool invert) {
- int n = (int)a.size();
- for (int i = 1, j = 0; i < n; ++i) {
- int bit = n >> 1;
- for (; j >= bit; bit >>= 1)
- j -= bit;
- j += bit;
- if (i < j)
- swap(a[i], a[j]);
- }
- for (int len = 2; len <= n; len <<= 1) {
- double ang = 2 * PI / len * (invert ? -1 : 1);
- base wlen(cos(ang), sin(ang));
- for (int i = 0; i < n; i += len) {
- base w(1);
- for (int j = 0; j < len / 2; ++j) {
- base u = a[i + j], v = a[i + j + len / 2] * w;
- a[i + j] = u + v;
- a[i + j + len / 2] = u - v;
- w *= wlen;
- }
- }
- }
- if (invert)
- for (int i = 0; i < n; ++i)
- a[i] /= n;
- }
- vector<int> multiply(const vector<int>& a, const vector<int>& b) {
- vector<base> fa(a.begin(), a.end()), fb(b.begin(), b.end());
- size_t n = 1;
- while (n < max(a.size(), b.size())) n <<= 1,
- ++count_ops;
- n <<= 1;
- fa.resize(n), fb.resize(n);
- fft(fa, false), fft(fb, false);
- for (size_t i = 0; i < n; ++i)
- fa[i] *= fb[i],
- ++count_ops;
- fft(fa, true);
- vector<long long> res(n);
- for (size_t i = 0; i < n; ++i) {
- res[i] = (long long)(fa[i].real() + 0.5),
- ++count_ops;
- if (res[i] < 0 || res[i] > 1e15) {
- cout << -1;
- res[i] = res[i];
- }
- }
- int carry = 0;
- for (size_t i = 0; i < n; ++i) {
- res[i] += carry;
- carry = res[i] / BASE;
- ++count_ops;
- res[i] %= BASE;
- }
- vector<int> r2(res.begin(), res.end());
- while (r2.size() && r2.back() == 0) r2.pop_back();
- if (!r2.size()) r2.push_back(0);
- return r2;
- }
- #define typ vector<int>
- const int N = 1000000;
- int lp[N + 1];
- vector<int> pr;
- void sieve() {
- for (int i = 2; i <= N; ++i) {
- if (lp[i] == 0) {
- lp[i] = i;
- pr.push_back(i);
- }
- for (int j = 0; j < (int)pr.size() && pr[j] <= lp[i] && i * pr[j] <= N; ++j)
- lp[i * pr[j]] = pr[j];
- }
- }
- #define pii pair<int, int>
- #define vec vector
- #define vi vector<int>
- #define int long long
- int popcount(int x) {
- int r = 0;
- while (x)r += x & 1, x >>= 1;
- return r;
- }
- signed main() {
- cin.tie(0);
- cout.tie(0);
- ios::sync_with_stdio(false);
- sieve();
- int k;
- cin >> k;
- cout << pr[pr[k - 1] - 1];
- }
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