class Solution(object):
def numRabbits(self, answers):
"""
:type answers: List[int]
:rtype: int
"""
dict={}
for x in answers:
if x in dict.keys():
dict[x]=dict[x]+1
else:
dict[x]=1
cnt=0
for k in dict.keys():
v=dict[k]
if v%(k+1)==0:
cnt+=v/(k+1)*(k+1)
else:
cnt+=v/(k+1)*(k+1)+(k+1)
return cnt