Consider a rectangle http://stuff.daniel15.com/cgi-bin/mathtex.cgi?l units long, and http://stuff.daniel15.com/cgi-bin/mathtex.cgi?w units wide and the http://stuff.daniel15.com/cgi-bin/mathtex.cgi?lw unit squares found in it. A diagonal is drawn from one corner to the opposite. The diagonal cuts through certain unit squares. Find in terms of http://stuff.daniel15.com/cgi-bin/mathtex.cgi?l and http://stuff.daniel15.com/cgi-bin/mathtex.cgi?w the number of unit squares that are cut through.