#include<stdio.h>
int main()
{long int n,i,j,t,s,c;
FILE *f,*g;
f=fopen("cifra.in","r");
g=fopen("cifra.out","w");
fscanf(f,"%ld",t);
for (i=1; i<=n; i++)
	{fscanf(f,"%ld", n);s=0;
	for (j=1; j<=n; f++)
		{c=j%10;
		switch(c)
		{case 0:s=s+c; break;
		case 1: s=s+c;break;
		case 2: switch (j%2)
						{case 0: s=s+2; break;
						case 1: s=s+4; break;
						case 2:s=s+8;break;
						case 3:s=s+6; break;  }; break;
		case 3: switch (j%3)
						{case 0:s=s+3; break;
						case 1: s=s+9; break;
						case 2: s=s+7; break;
						case 3: s=s+1; break;} break;
		case 4: switch (j%4)
						{case 0:s=s+4;  break;
						case 1: s=s+6;break;}; break;
		case 5:s=s+5; break;
		case 6: s=s+6; break;
		case 7: switch(j%7)
			{case 0: s=s+7; break;
			case 1: s=s+9;      break;
			case 2: s=s+3;break;
			case 3 : s=s+1; break;};break;
		case 8: switch (j%8)
				{case 0: s=s+8; break;
				case 1: s=s+4; break;
				case 2:s=s+2; break;
				case 3:s=s+6; break;};break ;
		case 9: switch(j%9)
				{case 0: s=s+9;    break;
				case 1: s=s+1;break;     }break;}}
		fprintf (f,"%d",s%10);}
fclose(f);
fclose(g);
return 0;}