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1#include <iostream>
2#include <iomanip>
3#include <algorithm>
4#include <string>
5#include <cstring>
6#include <vector>
7#include <cmath>
8#include <map>
9#include <climits>
10#include <stack>
11// climits for INT_MIN
12#include <unordered_map>
13using namespace std;
14int main()
15{
16    stack<int> s1;
17    s1.push(10);
18    s1.push(20);
19    s1.push(30);
20    s1.push(40);
21    s1.push(50);
22
23    cout << s1.size() << endl;
24    cout << s1.top() << endl;
25    s1.pop();
26    cout << s1.top() << endl;
27    cout << s1.size() << endl;
28    return 0;
29}