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#include<iostream>
#include<fstream>
using namespace std;
int main()
{
long long int n,v[11],d[11],i,r[11],sv,sd,ok,s1,s,j,t,k;
ifstream f("cifra.in");
ofstream g("cifra.out");
f>>t;
s=47;
v[1]=0;d[1]=0;r[1]=1;
v[2]=1;d[2]=1;r[2]=4;
v[3]=6;d[3]=4;r[3]=7;
v[4]=3;d[4]=7;r[4]=6;
v[5]=6;d[5]=6;r[5]=5;
v[6]=5;d[6]=5;r[6]=6;
v[7]=6;d[7]=6;r[7]=3;
v[8]=7;d[8]=3;r[8]=6;
v[9]=4;d[9]=8;r[9]=9;
v[10]=9;d[10]=9;
sv=47;
sd=49;
for(k=1;k<=t;k++)
{
f>>n;
ok=0;
s1=0;
if(n<=9)
{
ok=1;
for(i=1;i<=n;i++)
s1=s1+r[i];
g<<s1%10<<endl;
}
if(ok==0)
{
for(i=1;i<=n/10;i++)
{
if(i%2==1)
s=s+sv;
if(i%2==0)
s=s+sd;
}
for(j=1;j<=n%10;j++)
{
if(n%2==0)
{
s=s+v[j];
}
if(n%2==1)
{
s=s+d[j];
}
}
g<<s%10<<endl;
}
}
return 0;
}