#include <stdio.h>
#include <stdlib.h>


FILE *f = fopen("cifra.in","r");
FILE *g = fopen("cifra.out","w");

int i, j, T, A[1000];

int ultima ( int N )
{int i, c;
    for (i = 1; i < = N; ++i)
    {
        c = c + i*i %10;
    }
    fprintf (g,"%d\n",c);

return 0;
}
int main()
{
    fcanf( f,"%d",&T);
    for ( i=1;i<=T;i++)
    {
        fscanf (f,"%d",&A[i] );
        ultima ( A[i] );
    }

    fclose(f);
    fclose(g);

    return 0;

}