暴力艹过即可

#include<iostream>
#include<cstdio>
#include<algorithm>
#include<cmath>

#define LL long long
using namespace std;

LL n;
bool flg=false;

int main()
{
    scanf("%lld",&n);
    
    for(int i=0;;i++){
        LL x=i*n+1,p=sqrt(x);
        if(p>n) break;
        if(p*p==x){
            flg=true;
            printf("%lld\n",p);
        }
    }
    if(!flg) return puts("None"),0;
    return 0;
}