// Test '!' operator

class Main {
	void main() {
		boolean a,b,c,d;
		int x,y;
		
		a = true;
		c = !false;
		b = !a;
		x = 100;
		y = 5;
		
		if (a) {
		write(1);}
		writeln();
		
		if (!b){
			write(2);
		}
		writeln();
		
		while(c){
			write(3);
			c = false;
		}
		writeln();
		
		// !x < 2 * y --> !x type error
		// !(x < 2 * y) --> correct syntax
		while(!(x<2*y)){
			write(y);
			y = y*2;
		}
	}
}