N, X = map(int, input().split(" "))
ans = X
count = 0
while(True):
  if count == 0:
    ans = ans + N - X
    N -= X
    if N < X:
      tmp = N
      N = X
      X = tmp
    count = 1
  elif count == 1:
    ans = ans + X
    X = N-X
    if N < X:
      tmp = N
      N = X
      X = tmp
    count = 0
  if X == 0:
    break
print(ans)