22
22/2=11 11*3+1=34 34/2=17 17*3+1=52 52/2=26 26/2=13 13*3+1=40 40/2=20 20/2=10 10/2=5 5*3+1=16 16/2=8 8/2=4 4/2=2 2/2=1