A,P = (map(int,input().split()))
print(int((A*3+P)/2)) A,P = (map(int,input().split())) A map(int,input().split()) map int input().split() ().split () input split P print(int((A*3+P)/2)) print int((A*3+P)/2) int (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()))
print(int((A*3+P)/2))