3.py

n=int(input())
c=0
a=[]
b=[]
for i in range(n):
    a.append(i+1)
print(a)
while len(a)!=1:
    a.append(a.pop(0))
    c=c+1
    if c==3:
        a.pop(0)
        c=1    
print(a)