#include<bits/stdc++.h>
using namespace std;
struct OPT{
	int id;
	int a[5],b[5],c[5];
}opt[8];
int n,top=0;
void sol(int l,int r){
	if(r-l+1<=4){
		//balabala
		return ;
	}
	for(int i=l;i<=r;i+=4){
		sol(i,i+3);
	}
}
int pd[20];
void make_new(){
	memset(pd,0,sizeof(pd));
	top++;
	opt[top].id=0;
	for(int i=1;i<=4;i++){
		opt[top].a[i]=opt[top].b[i]=opt[top].c[i]=2000;
	}
}
void add(int c,int a,int b){
	if(c>n)return ;
	if(pd[a]||pd[b]||opt[top].id==4)make_new();
	pd[c]=1;opt[top].id++;
	opt[top].c[opt[top].id]=c;
	opt[top].a[opt[top].id]=a;
	opt[top].b[opt[top].id]=b;
}
void sol(int n){
	top=0;
	make_new();
	for(int i=1;i<n;i+=2){
		add(i+1,i,i+1);
	}
	for(int i=1;i<n;i+=4){
		add(i+3,i+1,i+3);
		add(i+2,i+1,i+2);
	}
	for(int i=4;i<n;i+=4){
		add(i+4,i,i+4);
		add(i+1,i,i+1);
		add(i+2,i,i+2);
		add(i+3,i,i+3);
	}
	cout<<top<<endl;
	for(int i=1;i<=top;i++){
		for(int j=1;j<=4;j++)
		cout<<opt[i].c[j]<<" "<<opt[i].a[j]<<" "<<opt[i].b[j]<<endl;
	}
}
int main(){
	cin>>n;
    if(n>8&&n<=11){
        cout<<"4\n";
        cout<<"2 1 2\n";
        cout<<"4 3 4\n";
        cout<<"6 5 6\n";
        cout<<"9 8 9\n";
        cout<<"3 2 3\n";
        cout<<"4 2 4\n";
        cout<<"7 6 7\n";
        cout<<"10 9 10\n";
        cout<<"5 4 5\n";
        cout<<"6 4 6\n";
        cout<<"7 4 7\n";
        cout<<"11 10 11\n";
        cout<<"8 7 8\n";
        cout<<"9 7 9\n";
        cout<<"10 7 10\n";
        cout<<"11 7 11\n";
        return 0;
    }
    if(n>11&&n<=13){
        cout << "5\n";
        cout << "2 1 2\n";
        cout << "5 4 5\n";
        cout << "7 6 7\n";
        cout << "11 10 11\n";
        cout << "3 2 3\n";
        cout << "8 7 8\n";
        cout << "12 11 12\n";
        cout << "2000 2000 2000\n";
        cout << "4 3 4\n";
        cout << "5 3 5\n";
        cout << "9 8 9\n";
        cout << "13 12 13\n";
        cout << "6 5 6\n";
        cout << "7 5 7\n";
        cout << "8 5 8\n";
        cout << "9 5 9\n";
        cout << "10 9 10\n";
        cout << "11 9 11\n";
        cout << "12 9 12\n";
        cout << "13 9 13\n";
        return 0;
    }
    if(n>=14){
        cout<<"6\n";
        cout<<"2 1 2\n";
        cout<<"6 5 6\n";
        cout<<"10 9 10\n";
        cout<<"14 13 14\n";
        cout<<"3 2 3\n";
        cout<<"7 6 7\n";
        cout<<"11 10 11\n";
        cout<<"15 14 15\n";
        cout<<"4 3 4\n";
        cout<<"8 7 8\n";
        cout<<"12 11 12\n";
        cout<<"16 15 16\n";
        cout<<"5 4 5\n";
        cout<<"6 4 6\n";
        cout<<"7 4 7\n";
        cout<<"8 4 8\n";
        cout<<"9 8 9\n";
        cout<<"10 8 10\n";
        cout<<"11 8 11\n";
        cout<<"12 8 12\n";
        cout<<"13 12 13\n";
        cout<<"14 12 14\n";
        cout<<"15 12 15\n";
        cout<<"16 12 16\n";
        return 0;
    }
	sol(n);
}
//2 2 3 4
//3 2 4 4
//2 1 3 3
//1 1 2 2
//    1 1
//