The reaction of compound P with $C{H}_{3}MgBr$ (excess) in ${\left(C_2{H}_5\right)}_{2}O$ followed by addition of $H_{2}O$ gives Q. The compound Q on treatment with  $H_{2}S{O}_4$ at $0^{0}C$ gives R. Compound R  with $C{H}_{3}COCl$ in presence of anhydrous  $AlC{l}_3$ in  $C{H}_{2}C{l}_2$ followed by treatment with  $H_{2}O$ produces compound S. The no. of carbons and degree of unsaturation in S is __ and ___respectively. The compound P is