#include <iostream>
#include <cstdlib>
using namespace std;

int main()
{
	const int nrows {30};   //number of rows of pixels
	const int ncols {40};   //number of columns of pixels

	cout << "P3\n"
		<< ncols << " " << nrows << "\n"
		<< 255 << "\n";

	for (int row {0}; row < nrows; ++row) {
		for (int col {0}; col < ncols; ++col) {
			if (row < 10) {
				cout << "0 0 0\n"; //top third is black
		        } else if (row < 20) {
			       	cout << "255 0 0\n";  // middle third is red	
			} else {
				cout << "255 215 0\n";   //lower third is yellow
			}
		}
	}

	return EXIT_SUCCESS;
}