// Contoh Bab 05: pola akumulasi -- jumlah, cacah, terbesar, faktorial.
//
// Compile:  g++ -std=c++17 -O2 -o akumulasi exercises/05/03-akumulasi.cpp
// Jalankan: ./akumulasi
// Lalu ketik satu angka, misalnya: 10

#include <iostream>
using namespace std;

int main() {
    int n;
    cin >> n;

    long long total = 0;
    for (int i = 1; i <= n; i++) total += i;
    cout << "jumlah 1.." << n << " = " << total << "\n";

    int banyak = 0;
    for (int i = 1; i <= n; i++) if (i % 3 == 0) banyak++;
    cout << "kelipatan 3 = " << banyak << "\n";

    long long faktorial = 1;
    for (int i = 2; i <= n; i++) faktorial *= i;
    cout << n << "! = " << faktorial << "\n";

    return 0;
}