def sum_l(n):
sum_a=0
for i in str(n):
sum_a+=int(i)**2
return sum_a

sum1=[]
n=int(input(“请输入数字:”))

while sum_l(n) not in sum1:
n=sum_l(n)
sum1.append(n)
if n==1:
print(“是快乐数。”)

else:
print(“不是快乐数。”)