x=input()
x=int(x)
bit=0
cnt = 0
sub=0
v = 0
if x%2!=0:
cnt=(x+1)/2-1
else :
cnt=x/2-1
cnt1=x-cnt
v=x-int(cnt)
for i in range(1,v):
if cnt<i+(cnt1-i):
if cnt >= i and cnt >= cnt1 - i:
print(int(cnt),i,int(cnt1-i))
sub = (sub + 1)
if i==cnt1-i:
sub=sub+
bit = int(sub/2)
for i in range(1,v):
if i*3==x:
bit=bit+1
print(i,i,i)
print(bit)