#include <iostream>
#include <cmath>
#include <vector>
using namespace std;
int main() {
    
    vector<int> v;

    v.push_back(1);
    v.push_back(2);
    cout << v.size() << endl;

    v.push_back(3);
    cout << v.size() << endl;
    
    return 0;
}