
people = {}
for a in range(1,31):
people[a] = a
i = 1
j = 0
k = 0
while i <=31:
if i == 31:
i = 1
continue
elif k ==15:
break
else:
if people[i] == 0:
i += 1
continue
else:
j += 1
if j == 9:
people[i] = 0
print("{}下船了".format(i))
k += 1
j = 0
else:
i += 1
continue


