#include<bits/stdc++.h>
#define Gc() getchar() 
#define Me(x,y) memset(x,y,sizeof(x))
#define Mc(x,y) memcpy(x,y,sizeof(x))
#define d(x,y) ((m)*(x-1)+(y))
#define R(n) (rnd()%(n)+1)
#define Pc(x) putchar(x)
#define LB lower_bound
#define UB upper_bound
#define fi first
#define se second
using namespace std;using ll=long long;using db=double;using lb=long db;using ui=unsigned;using ull=unsigned long long;using pii=pair<int,int>;using LL=__int128;
const int N=2e5+5,M=N*100+5,K=600+5,mod=1e9+7,Mod=mod-1;const db eps=1e-9;const int INF=1e9+7;mt19937 rnd(263082);
int n;
vector<tuple<int,int,int> > ans;
void Do(int x,int y,int z){ans.emplace_back(x,y,z);}
void Solve(){
	int i,j;scanf("%d",&n);
	int m=1;
	while(m+15<=n){
		for(i=m;i<m+3;i++) {
			for(j=i;j<m+15;j+=4) Do(j+1,j,j+1);
		}
		for(i=m+3;i<m+15;i+=4) for(j=i+1;j<=i+4;j++) Do(j,i,j);
		m+=15;
	}
	if(m==n){

	}else if(m+1>=n){
		Do(m+1,m,m+1);Do(2000,2000,2000);Do(2000,2000,2000);Do(2000,2000,2000);
	}else if(m+3>=n){
		Do(m+1,m,m+1);Do(m+3,m+2,m+3);Do(2000,2000,2000);Do(2000,2000,2000);
		Do(m+2,m+1,m+2);Do(m+3,m+1,m+3);Do(2000,2000,2000);Do(2000,2000,2000);
	}else if(m+7>=n){
		Do(m+1,m,m+1);Do(m+3,m+2,m+3);Do(m+5,m+4,m+5);Do(m+7,m+6,m+7);
		Do(m+2,m+1,m+2);Do(m+3,m+1,m+3);Do(m+6,m+5,m+6);Do(m+7,m+5,m+7);
		Do(m+4,m+3,m+4);Do(m+5,m+3,m+5);Do(m+6,m+3,m+6);Do(m+7,m+3,m+7);
	}
	printf("%d\n",ans.size()/4);
	for(auto i:ans){
		int x,y,z;tie(x,y,z)=i;
		printf("%d %d %d\n",x,y,z);
	}
}
int main(){
	int t=1;
	// scanf("%d",&t);
	while(t--) Solve();
	cerr<<clock()*1.0/CLOCKS_PER_SEC<<'\n';
}