#include <bits/stdc++.h>
#define ll long long
#define pii pair<int,int>
#define fi first
#define se second
#define pb push_back
using namespace std;
int main()
{
ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
int n,i,j;
cin>>n;
if(n%4 != 0){
cout<<-1;
return 0;
}
cout<<n/4*2;
return 0;
}
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