python 15行
def main():
N = int(input())
nums = [int(i) for i in input().split()]
s = set(nums)
d = {i:nums.count(i) for i in s}
m = min(d.values())
if m<2:
return 0
res = 0
for k in d:
cnt = d[k]//m
if d[k]%m!=0:
return 0
res += cnt
return res