print(eval("3*"+input().replace(" ","+"))//2) print(eval("3*"+input().replace(" ","+"))//2) print eval("3*"+input().replace(" ","+"))//2 eval("3*"+input().replace(" ","+")) eval "3*"+input().replace(" ","+") "3*" input().replace(" ","+") ().replace () input replace " " "+" 2
print(eval("3*"+input().replace(" ","+"))//2)