Burana tower stands near Tokmak town. We demand: a person who has been on top of the tower 5 minutes, must go down; while he comes down, people those below the tower must wait. Climbing the tower stairs and descending the stairs of the tower take one minute. Every moment on the stairs there can be only one person. Now there is no one at the top of the tower, at the foot of the tower there is a person in line A. After T minutes, B more people will come up. After what time (minutes) all people will come out of the tower (the last person will go down the stairs)?