#include <iostream>
using namespace std;
void zydowo(){
	int walizka1;
	int i;
	cout << "Wybierz 1 lub 2\n";
	cin >> walizka1;

	switch (walizka1) {
	case 1:
		cout << "Wypiszemy ciag 1-20\n";
		for (i = 1; i <= 20; i++)
			cout << i << " ";
		break;
	case 2:
		cout << "Wypiszemy ciag 2-20\n";
		for (i = 2; i <= 20; i = i + 2)
			cout << i << " ";
		break;
	default:
		cout << "nothin";
		break;
	}

	int main(){

		zydowo();

	}
}