#include <iostream>
#include<stdio.h>
int z,j,T,i,n[30000],s,p,u;
using namespace std;

int main()
{
FILE*f=fopen("cifra.in","r");
FILE*g=fopen("cifra.out","w");
fscanf(f,"%d",&T);
for(i=1;i<=T;i++){
    fscanf(f,"%d",&n[i]);
}
for(z=1;z<=T;z++){s=0;p=1;
    for(i=1;i<=n[z];i++){
        for(j=1;j<=i;j++){
            p=p*i;
            }
         s=s+p;
    }
    u=s%10;
    fprinf(g," %d \n ",u);
}
fclose(f);
fclose(g);
    return 0;
}