#include <iostream>
#include <vector>
 
int main(int argc, char *argv[] ) {
 std::vector<int> vec;    // vector contains integer elements
 
 // append 10 integers
 for (int i=1; i<=10; ++i) {
    vec.push_back(i*21);
 }
 
 // print one element on a line
 for (int i=0; i<vec.size(); ++i) {
      std::cout << vec[i] << '\n';
 }
 return 0;
}