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#include <iostream>
#include <fstream>
using namespace std;
int pow(int a);
int main()
{
ifstream cin("cifra.in");
ofstream cout("cifra.out");
int T,a=0;
cin>>T;
int arr[T];
int val[T]={0};
for(int i=0;i<T;i++){
cin>>arr[i];
}
for(int i=0;i<T;i++){
int b=0;
while(arr[i]-b!=0){
val[a]+=pow(arr[i]-b);
b++;}
val[a]=val[a]%10;
a++;
}
for(int j=0;j<T;j++){
cout<<val[j]<<"\n";
}
return 0;
}
int pow(int a){
int c=a;
int d=1;
for(int b=1;b<=c;b++){
d*=a;
}
return d;
}