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#include <fstream>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
int n,i,v;
int main()
{
f>>v;
for(i=0;i<v;i++)
{
f>>n;
int x=n%20;
int sum=94*(n/20);
if(x==1) sum+=1;
if(x==2) sum+=5;
if(x==3) sum+=12;
if(x==4) sum+=18;
if(x==5) sum+=23;
if(x==6) sum+=29;
if(x==7) sum+=32;
if(x==8) sum+=38;
if(x==9) sum+=47;
if(x==10) sum+=47;
if(x==11) sum+=48;
if(x==12) sum+=54;
if(x==13) sum+=57;
if(x==14) sum+=63;
if(x==15) sum+=68;
if(x==16) sum+=74;
if(x==17) sum+=81;
if(x==18) sum+=85;
if(x==19) {sum+=94;}
g<<sum%10<<'\n';
}
}