#include <bits/stdc++.h>
using namespace std;
using i64 = long long;
using ll = long long;
#define pb emplace_back
#define X first
#define Y second
#define AI(i) begin(i), end(i)
template<class T> bool chmax(T &a, T b) { return a < b && (a = b, true);}
template<class T> bool chmin(T &a, T b) { return b < a && (a = b, true);}
#ifdef KEV
#define DE(args...) kout("[ " + string(#args) + " ] = ", args)
void kout() { cerr << endl; }
template<class T, class ...U> void kout(T a, U ...b) { cerr << a << ' ', kout(b...); }
template<class T> void debug(T l, T r) { while (l != r) cerr << *l++ << " \n"[l==r]; }
#else
#define DE(...) 0
#define debug(...) 0
#endif

const int MAX_N = 300010;
int main() {
	ios_base::sync_with_stdio(0), cin.tie(0);

	int n;
	cin >> n;

	for (int i = 1; i <= n; i++) {
		cout << i << ' ' << n + n - i << '\n';
	}

	cout << '\n';

	auto cover = [&](int l, int r) {
		cout << r << ' ' << n + n - l << '\n';
	};

	int i = 0;

	while (i < n) {
		if (i + 4 <= n) {
			cover(i + 1, i + 2);
			cover(i + 2, i + 4);
			cover(i + 2, i + 4);
			cover(i + 2, i + 4);
		} else {
			for (int rep = 0; rep < n - i; rep++) {
				cover(i + 1 + rep, i + 1 + rep);
			}
		}
		i += 4;
	}
}