python完全数计算，分两步，一个函数求约数和，其他的做判断
iNOC产品部--完全数计算
http://www.nowcoder.com/questionTerminal/7299c12e6abb437c87ad3e712383ff84
encoding:utf-8
def com(n): #求约数的函数
sum = 0
for i in range(1,n/2+1):
if n%i == 0:
# print i
sum = sum+i
# i = i+1
return sumif name == 'main':
while True:
try:
s = input()
if s>0 and s<=500000:
i = 1
count = 0
while i<=s:
sum = com(i)
# print 'sum,i',sum,i
if sum == i:
count = count +1
# print 'sum==i'
i= i+1
print count
else:
print '-1'
except:
break