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#include<iostream>
using namespace std;
#include<vector>
int main() {int n;cin >> n;vector<int> s(n);int left = 0;int right = n - 1;int t = n * 2 - 2;while (left <= right) {s[left] = s[right] = t;t -= 2;left++;right--;}for (int i = 0; i < n; i++)cout << s[i] << endl;return 0;
}