from cmath import *
from decimal import *
import sys
def _input(): return map(int, input().split())
def _lst(): return list(map(int, input().split()))
def _int(): return int(input())
a=[0]*10001
def solves():
n=int(input())
if n==1:
print(-1)
else:
print(n,n)
t=1
for i in range(2,10000):
if a[i]==0:
for j in range(i*2,10000,i):
a[j]=1
for _ in range(0,t):
solves()
#include<bits/stdc++.h>
using namespace std;
typedef long long int ll;
int main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
ll test,h,p,i,j,s,xy,n,flag=0,u,count,d,o1=0,o2=0,e,l,r,x,y,m,z,max1,x1,y1,k,x2,y2,z1,z2,sum,min1;
cin>>n;
if(n==1){
cout<<"-1\n";
}else{
cout<<n<<" "<<n<<"\n";
}
return 0;
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