#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
template<class T> void check_min(T &a, const T &b){ a = (a < b) ? a : b; }
template<class T> void check_max(T &a, const T &b){ a = (a > b) ? a : b; }
#define all(x) (x).begin(), (x).end()

void output(vector<vector<array<int, 3>>> ins){
    cout << ins.size() << "\n";
    for(auto v: ins){
        for(auto [a, b, c]: v)
            cout << a << " " << b << " " << c << "\n";
    }
    exit(0);
}

void fix_add(vector<array<int, 3>> &add){
    while(add.size() != 4){
        add.push_back({2000, 2000, 2000});
    }
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(NULL);

    int n;
    cin >> n;

    vector<vector<array<int, 3>>> ins{
        {
            {2, 1, 2},
            {4, 3, 4},
            {6, 5, 6},
            {8, 7, 8},
        },
        {
            {3, 2, 3},
            {4, 2, 4},
            {7, 6, 7},
            {8, 6, 8},
        },
        {
            {5, 4, 5},
            {6, 4, 6},
            {7, 4, 7},
            {8, 4, 8},
        }
    };

    if(n <= 8){
        if(n <= 2){
            ins.resize(1);
            output(ins);
        }
        if(n <= 4){
            ins.resize(2);
            output(ins);
        }
        output(ins);
    }

    ins.clear();

    typedef vector<array<int, 3>> vec;

    if(n <= 11){
        ins.push_back(vec{
            {2, 1, 2},
            {4, 3, 4},
            {6, 5, 6},
            {9, 8, 9},
        });
        ins.push_back({
            {4, 2, 4},
            {7, 6, 7},
            {10, 9, 10},
            {3, 2, 3},
        });
        ins.push_back({
            {5, 4, 5},
            {6, 4, 6},
            {7, 4, 7},
            {11, 10, 11},
        });
        ins.push_back({
            {8, 7, 8},
            {9, 7, 9},
            {10, 7, 10},
            {11, 7, 11},
        });
        output(ins);
    }
    if(n <= 13){
        ins.push_back({
            {2, 1, 2},
            {4, 3, 4},
            {6, 5, 6},
            {9, 8, 9},
        });
        ins.push_back({
            {4, 2, 4},
            {7, 6, 7},
            {10, 9, 10},
            {12, 11, 12},
        });
        ins.push_back({
            {5, 4, 5},
            {6, 4, 6},
            {7, 4, 7},
            {13, 12 13}
        });
        ins.push_back({
            {8, 7, 8},
            {9, 7, 9},
            {10, 7, 10},
            {3, 2, 3}
        });
        ins.push_back({
            {11, 10, 11},
            {12, 10, 12},
            {13, 10, 13},
            {2000, 2000, 2000}
        });
        output(ins);
    }
    if(n <= 16){
        ins.push_back({
            {2, 1, 2},
            {4, 3, 4},
            {6, 5, 6},
            {9, 8, 9},
        });
        ins.push_back({
            {4, 2, 4},
            {7, 6, 7},
            {10, 9, 10},
            {12, 11, 12},
        });
        ins.push_back({
            {5, 4, 5},
            {6, 4, 6},
            {7, 4, 7},
            {13, 12, 13}
        });
        ins.push_back({
            {8, 7, 8},
            {9, 7, 9},
            {10, 7, 10},
            {15, 14, 15}
        });
        ins.push_back({
            {11, 10, 11},
            {12, 10, 12},
            {13, 10, 13},
            {16, 15, 16}
        });
        ins.push_back({
            {14, 13, 14},
            {15, 13, 15},
            {16, 13, 16},
            {3, 2, 3}
        });
        output(ins);
    }

}

answer.code: In function ‘int main()’:
answer.code:113:21: error: expected ‘}’ before numeric constant
  113 |             {13, 12 13}
      |             ~       ^~
answer.code:113:21: error: expected ‘}’ before numeric constant
answer.code:109:23: note: to match this ‘{’
  109 |         ins.push_back({
      |                       ^
answer.code:113:20: error: expected ‘)’ before numeric constant
  113 |             {13, 12 13}
      |                    ^~~
      |                    )
answer.code:109:22: note: to match this ‘(’
  109 |         ins.push_back({
      |                      ^
answer.code: At global scope:
answer.code:114:10: error: expected unqualified-id before ‘)’ token
  114 |         });
      |          ^
answer.code:115:9: error: ‘ins’ does not name a type; did you mean ‘int’?
  115 |         ins.push_back({
      |         ^~~
      |         int
answer.code:120:10: error: expected unqualified-id before ‘)’ token
  120 |         });
      |          ^
answer.code:121:9: error: ‘ins’ does not name a type; did you mean ‘int’?
  121 |         ins.push_back({
      |         ^~~
      |         int
answer.code:126:10: error: expected unqualified-id before ‘)’ token
  126 |         });
      |          ^
answer.code:127:15: error: expected constructor, destructor, or type conversion before ‘(’ token
  127 |         output(ins);
      |               ^
answer.code:128:5: error: expected declaration before ‘}’ token
  128 |     }
      |     ^
answer.code:129:5: error: expected unqualified-id before ‘if’
  129 |     if(n <= 16){
      |     ^~
answer.code:169:1: error: expected declaration before ‘}’ token
  169 | }
      | ^