a,p = map(int, input().split())
print(int((3*a+p)/2)) a,p = map(int, input().split()) a map(int, input().split()) map int input().split() ().split () input split p print(int((3*a+p)/2)) print int((3*a+p)/2) int (3*a+p)/2 3*a+p 3*a 3 a p 2 a,p = map(int, input().split()) map(int, input().split()) a p = map(int, input().split()) map(int, input().split()) p
a,p = map(int, input().split())
print(int((3*a+p)/2))