#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<bitset>
#include<set>
#include<map>
#include<stack>
#include<queue>
#include<deque>
#include<list>
#include<iomanip>
#include<cmath>
#include<cstring>
#include<functional>
#include<cstdio>
#include<cstdlib>
using namespace std;
 
#define repr(i, a, b) for (int i = (int)(a); i < (int)(b); i++)
#define rep(i, n) repr(i, 0, n)
#define INF 2e9
#define MOD 1000000007
//#define MOD 998244353
#define LINF (long long)4e18
#define jck 3.141592
 
const double EPS = 1e-10;
 
using ll = long long;
using Pi = pair<int,int>;
using Pl = pair<ll,ll>;

set<ll> divisor(ll n){
    set<ll> s;
    for(ll i = 1; i*i <= n; i++){
        if(n % i == 0){
            s.insert(i);
            s.insert(n/i);
        }
    }
    return s;
}

int main(){
    int X; cin >> X;
    int d = X/2;
    int now = INF;
    vector<Pi> ans[10000];
    repr(i,max(1,d-500),d+1){
        int d2 = X-i;
        if(d2 <= 0) continue;
        set<ll> div = divisor(i);
        set<ll> div2 = divisor(d2);
        int f = abs(i-d2-(int)div.size()+(int)div2.size());
        if(f <= now){
            now = f;
            ans[f].push_back(Pi(i,d2));
        }
    }
    rep(i,ans[now].size()){
        cout << ans[now][i].first << " " << ans[now][i].second << endl;
    }
    for(int i = ans[now].size()-1; i >= 0; i--){
        if(ans[now][i].first == ans[now][i].second) continue;
        cout << ans[now][i].second << " " << ans[now][i].first << endl;
    }

}