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！