Untitled

Bai 1:

#include <bits/stdc++.h>
using namespace std;
int main() {
	int n,tong;
	cin >> n;
	for (int i = 1; i <= n ; i ++) {
		tong += i;
	}
	cout << tong;
}

Bai 2:

#include <bits/stdc++.h>
using namespace std;
int main() {
	int n;
	cin >> n;
	int sophirain;
	sophirain += 2022;
	for (int i = 1; i <= n; i++) {
		sophirain += (i*2);
	}
        cout << sophirain;
}

Bai 3 :

#include <bits/stdc++.h>
using namespace std;
int main() {
	int n,k;
	cin >> n;
	while (n != 0) {
		n /= 10;
		k++;
	}
	cout << k;
}

Bai 4:

#include <bits/stdc++.h>
using namespace std;
int main() {
	int n,k;
	cin >> n;
	for (int i = 2; i <= n; i++) {
		if (n % i == 0) {
			cout << i;
			break;
		}
	}
}

Bai 5:

#include <bits/stdc++.h>
using namespace std;
int main() {
	int n;
	cin >> n;
	for (int i = 1; i <= n; i++) {
		if (i % 5 == 0) {
			cout << i << " ";
		}
	}
}

Bai 6:

#include <bits/stdc++.h>
using namespace std;
int main() {
	int n;
	cin >> n;
	for (int i = 1; i <= n; i++) {
		if (i % 3 == 0 && i % 5 != 0) {
			cout << i << " ";
		}
	}
}