#include <bits/stdc++.h>
using namespace std;
bool check (long long x)
{
    for (long long i=2; i <= sqrt(x); ++i)
    if (x%i==0) return false;
    return x>1;
}
long long n;
bool t = false;
int main()
{
   cin >> n;
   for (long long i=2;i<=n;++i)
   {
    if (check(i) and check(i+2))
    {
        cout<<i<<" "<<i+2;
        cout<<"\n";        
        t=true;
    }
   }
   if (!t) cout << "No";
}