n=int(input())
m=(2**n)-1
a=0
list1=[]
while m!=0:
a+=1
list1.insert(0,m%10)
m=m//10
b=len(list1)
if b<500:
for i in range(500-b):
list1.insert(0,0)
print(a)
for i in range(len(list1)):
print(list1[i],end='')
if (i+1)%50==0:
print(end='\n')
初学python,请大佬指点,十分感谢!