include <bits/stdc++.h>

cin >> n;
n--;
while(n--)
{
    scx *= 10;
    sgh = (sgh * 10) + 9;
}
while(scx < sgh)
{
    if(scx % 3 == 0 && scx % 7 == 0)
    {
        cout << scx;
        exit(0); //
    }
    scx++;
}
cout << -1;
return 0;