import sys
import math
import bisect

def main():
    a, p = map(int, input().split())
    p += a * 3
    print(p // 2)
    
if __name__ == "__main__":
    main() import sys sys import math math import bisect bisect def main():
    a, p = map(int, input().split())
    p += a * 3
    print(p // 2)
     main a, p = map(int, input().split()) a map(int, input().split()) map int input().split() ().split () input split p p += a * 3 p a * 3 a 3 print(p // 2) print p // 2 p 2 if __name__ == "__main__":
    main() __name__ == "__main__" __name__ "__main__" main() main def main():
    a, p = map(int, input().split())
    p += a * 3
    print(p // 2)
     def main():
    a, p = map(int, input().split())
    p += a * 3
    print(p // 2)
     main
import sys
import math
import bisect

def main():
    a, p = map(int, input().split())
    p += a * 3
    print(p // 2)
    
if __name__ == "__main__":
    main()
