class pair<element> {
    private element x, y;
    
    public pair(element x, element y) {
	this.x = x; this.y = y;
    }

    element first() { return x; }
    element second() { return y; }
}


public class pair {
    public static void main( String[] args ) {
        pair<Integer> p = new pair<Integer>(3,7);
	System.out.println(p.first() + p.second());
    }
}