#include <bits/stdc++.h> using namespace std; vector<int> c(int n){ vector<int> m(n); for(int i=0;i<n;++i){ if (i%2==0){ m[i]=i/2+1; } else{ m[i]=n-i/2; } } return m; } int main() { int n; cin>>n; vector<int> m=c(n); for (int k:m){ cout<<k<<" "; } cout<<endl; return 0; }