12 times- K- H9 r( b! k: h: Z& g, x9 G
tvb now,tvbnow,bttvb# F% ?: O1 @' b. s
each time 4 person but 1 need to back to pick up the other 3
7 A0 ^) ^: `+ X1 e/ C$ e5.39.217.76return x 10 = 30 peopletvb now,tvbnow,bttvb; c( Z- B" [3 X6 M0 V" d, R
1 time return$ `8 ~- n0 K: W2 a# ~
2 person on last time
0 u* W$ |: A9 r% @1 V) x' Atvb now,tvbnow,bttvbtotal : 12 times |