#include <iostream>
#include <fstream>

using namespace std;

int main(){
    int T, N, S=1, s=2, i, q, j;

    ifstream cifra_in("cifra.in");
    cifra_in>>T;;
    ofstream cifra_out("cifra.out");
    for(i=0; i<T; i++){
        cifra_in>>N;
        for(q=2; q<=N; q++){
            for(j=1; j<q; j++){
                s=(s*q)%10;
            }
        S=(S+s)%10;
        s=q+1;
        }
        cifra_out<<S;
    }

    // moves the vector into the *out* file
    return 0;
}