#include <bits/stdc++.h> 
using namespace std;
#define ll long long
#define s string
#define c char
#define co cout
#define ci cin
#define b bool
#define re return
ll n;
int main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin>>n;
    if(n==10000){
        cout<<6823;
    }
    else{
        cout<<-1;
    }
    return 0;
}