cycle_1_3

#include <iostream>
#include <math.h>

using namespace std;

int del(int n) {
    int cnt = 0;
    int s = (int)sqrt(n);
    for (int i = 1; i <= s; ++ i) {
        if (n % i == 0) {
            cnt ++;
            if (n / i != i)
                cnt++;
        }
    }
    return cnt;
}

int main(void) {
    int n;
    cout << "n=";
    cin >> n;
    for (int i = 2; i <= n; ++ i)
        if (del(i) == 2)
            cout << i << " ";
    cout << endl;
    return 0;
}