n=int(input()) m=n l=[] for i in range (n): l.append(0) i=-1 j=0 while m!=1: i+=1 if i==n: i=0 if l[i]==0: j+=1 if j==3: l[i]=1 m-=1 j=0 for k in range (n) : if l[k]==0 : print(k+1)