#include <stdio.h>
#include <math.h>

using namespace std;

int main()
{
    FILE *f=fopen("cifra.in","r");
    FILE *g=fopen("cifra.out","w");
    long t,sz,szj,n=0;
    for(int i=0;i<t;i++)
    {
        fscanf(f,"%d",&sz);
        for(int j=1;j<=sz;j++)
           n=n+pow(j,j);
        szj=n%10;
        fprintf(g,"%d",szj);
        n=0;
    }
    fclose(f);
    fclose(g);
    return 0;
}