#include<bits/stdc++.h>
using namespace std;
typedef long long ll;


signed main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout << fixed << setprecision(20);

    int n;
    cin>>n;
    if(n==2){
        cout << 1 << " " << 1<< endl;
        return 0;
    }
    vector<int> v(n+1,1);
    vector<vector<int>> ans(2*n+1);
    for(int i=2;i<=n;i++){
        for(int j=i;j<=n;j+=i){
            v[j]++;
        }
        v[i] = i-v[i];
        if(i > n-i){
            ans[abs(v[i]-v[n-i])].push_back(i);
            ans[abs(v[i]-v[n-i])].push_back(n-i);
        }
        if(i==n-i){
            ans[abs(v[i]-v[n-i])].push_back(i);
        }
    }
    for(int i=0;i<=n;i++){
        if(ans[i].size()){
            sort(ans[i].begin(),ans[i].end());
            for(auto j:ans[i]){
                cout << j << " " << n-j << "\n";
            }
            return 0;
        }
    }
}