Starting at temperature 300 K, one mole of an ideal diatomic gas ( γ=1.4 ) is first compressed adiabatically from volume V1 to V2=16V1 . It is then allowed to expand isobarically to volume 2V2 . If all the processes are the quasi-static then the final temperature of the gas (in ∘K ) is (to the nearest integer) _____.