import java.util.Stack;

public class StacksRFun {

	public static void main(String[] args) {
		
		// Y
		// B
		// R
		
		Stack<Character> tower = new Stack<Character>();
		
		tower.add('R');
		tower.add('B');
		tower.add('Y');
		
		System.out.println(tower.size());
		
	}

}