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#include <fstream>
#include <cstring>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
long int t,v[102],u,i,j,x;
char sir[102];
int main()
{
f>>t;
for(i=1;i<=100;i++)
{
u=i;
for(j=2;j<=i;j++)
u=(u*i)%10;
v[i]=(v[i-1]+u)%10;
}
for(i=1;i<=t;i++)
{
f>>sir;
if(1<strlen(sir))
x=(sir[strlen(sir)-2]-'0')*10+(sir[strlen(sir)-1]-'0');
else
x=sir[strlen(sir)-1]-'0';
g<<v[x]<<"\n";
}
return 0;
}