#include <iostream>
#include <fstream>

using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
int main()
{
    int s,x,m,n,v[10]={0,1,4,7,6,5,6,3,6,9};
    f>>m;
    while (m--){
        f>>n;
        s=n/10*7%10;
        x=n/10*10;
        for (int i=x+1;i<=n;i++){
            s=(s+v[i%10])%10;
        }
        g<<s<<'\n';
    }
    f.close();
    g.close();
    return 0;
}