#include <stdio.h>
#include <stdlib.h>
#include <math.h>
int calc(int x)
{int c,s=0;int j;
 for(j=1;j<=x;j++)
   s+= ((int)pow(j,j))%10;
   return s;
  }   
  int main()
{ FILE *f,*g; int n,i,t,j;
  f=fopen("cifra.in","r");
  g=fopen("cifra.out","w");
   fscanf(f,"%d",&t);
   for(i=1;i<=t;i++)
    fscanf(f,"%d",&n);
      fprintf(g,"%d",calc(n));
  fclose(g);
  fclose(f);
  return 0;
  system("PAUSE");
}