#include<bits/stdc++.h>
using namespace std;
bool check(int num) {
    if (num <= 1)
        return false;
    for (int i = 2; i * i <= num; ++i) {
        if (num % i == 0)
            return false;
    }
    return true;
}
int main() {
    int x;
    cin >> x;
    vector<int> primes;
    int sum = 0;
    for (int i = 2; sum + i <= x; ++i) {
        if (check(i)) {
            primes.push_back(i);
            sum += i;
        }
    }
    for (int prime : primes) {
        cout << prime << endl;
    }
    cout << primes.size() << endl;
    return 0;
}

不用 vector 只能度过一个相对失败的人生（