//
//  main.cpp
//  a1
//
//  Created by abc on 9/20/12.
//  Copyright (c) 2012 abc. All rights reserved.
//

# include <iostream>
# include <cstdio>
# include <cstdlib>
# include <iomanip>
# include <cmath>
# include <map>
# include <vector>
# include <set>
# include <algorithm>

using namespace std;

# define ISALPHA(Q) (('a' <= Q && Q <= 'z') || ('A' <= Q && Q <= 'Z'))
# define ISDIGIT(a) ('0' <= a  && a <= '9')
# define TODIGIT(a) (a - '0')

# define LIKELY(a)   (__builtin_expect((a), 1))
# define UNLIKELY(a) (__builtin_expect(!!(a), 0))

typedef unsigned char U8;
typedef long long LONG;

void init()
{
    freopen("lacate.in", "r", stdin);
    freopen("lacate.out", "w", stdout);
}

template <typename T> void read(vector<T> &vec)
{
    for(size_t i=0; i<vec.size(); ++i) {
        cin >> vec[i];
    }
}

struct P2d
{
    double x, y;
};

int main(int argc, const char * argv[])
{
    init();
    
    int N; cin >> N;
    if (N == 2) printf("1 1\n1\n1");
    else {
        cout << N << " " << 2 << endl;
        for(int i=1; i<=N; ++i)
            cout << i << " " << i%N+1 << endl;
    }
    return 0;
}