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233 A.cpp
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/**
* Git >> Mohsin_Riad
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**/
#include<bits/stdc++.h>
using namespace std;
#define IOS ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define mx 1000
#define endl "\n"
#define pb push_back
#define pob pop_back
typedef long long ll;
typedef double dd;
const int N = 1e5;
int part(int n)
{
if(n!=0)
{
cout<<n<<" ";
return part(n-1);
}
}
int main()
{
IOS
int n;
cin>>n;
if(n%2 != 0) cout<<"-1"<<endl;
else part(n);
return (0);
}