#include<iostream>
#include<vector>
#include<set>
using namespace std;

int add(int a, int b) {
    return a + b;
}

float add(float a, float b) {
    return a + b;
}

int add(vector<int> v) {
    int sum = 0;
    for (auto i : v)
        sum += i;
    return sum;
}

int add(set<int> st) {
    int sum = 0;
    for (auto i : st)
        sum += i;
    return sum;
}

bool search(int key, set<int> data_structure) {
    return data_structure.find(key) != data_structure.end();
}

int main() {
    set<int> st;
    int n, a;
    cout << "Enter the number of elements: ";
    cin >> n;
    cout << "Enter the elements:\n";
    for (int i = 0; i < n; i++) {
        cin >> a;
        st.insert(a);
    }

    cout << "Sum of elements in the set: " << add(st) << endl;

    int keyToSearch;
    cout << "Enter the key to search: ";
    cin >> keyToSearch;
    if (search(keyToSearch, st))
        cout << "Key found!\n";
    else
        cout << "Key not found!\n";

    return 0;
}