A, P = map(int,input().split())

if A == 0 and P < 2:
	print(0)
else:
	print((A * 3 + P ) // 2) A, P = map(int,input().split()) A map(int,input().split()) map int input().split() ().split () input split P if A == 0 and P < 2:
	print(0)
else:
	print((A * 3 + P ) // 2) A == 0 and P < 2 A == 0 A 0 P < 2 P 2 print(0) print 0 print((A * 3 + P ) // 2) print (A * 3 + P ) // 2 A * 3 + P A * 3 A 3 P 2 P = map(int,input().split()) map(int,input().split()) P A, P = map(int,input().split()) map(int,input().split()) A
A, P = map(int,input().split())

if A == 0 and P < 2:
	print(0)
else:
	print((A * 3 + P ) // 2)