#include <bits/stdc++.h>

using namespace std;

using ll = long long;

constexpr char newl = '\n';

template<typename T>
vector<T> sieve(T n) {
    vector<T> res;
    vector<bool> is_prime(n + 1, true);
    is_prime[0] = false;
    is_prime[1] = false;
    for (T i = 2; i <= n; i++) {
        if (!is_prime[i]) continue;
        res.emplace_back(i);
        for (T j = 2 * i; j <= n; j += i) is_prime[j] = false;
    }
    return res;
}

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

    vector<int> v = sieve(200000);
    int n;
    cin >> n;
    if (n == 1) {
        cout << 1 << newl;
        return 0;
    }

    --n;
    int ans = 100000;
    for (int i = 0; i < n; i++) {
        ans = *upper_bound(v.begin(), v.end(), ans);
    }
    cout << ans << newl;
    return 0;
}