Two brothers, Pedro and John, have a straight log in their backyard. Pedro wants the log cut into 24 equal parts, so he paints red lines on the log and asks a lumberjack to cut the log on the painted lines. John wants the log cut too, but into 18 equal parts. So before the lumberjack arrives, he paints yellow lines on the log, with some yellow lines painted over red lines. The lumberjack arrives and cuts the log on the painted lines of any color. How many cuts did the lumberjack make?