hdu1097

 

#include<stdio.h>
int main()
{
 int a,b;
 int t;  
 int res;
 while(scanf("%d%d",&a,&b)!=EOF) 
 {  
  t=a%10; 
  res=1;    
  while(b)   
  {        
   if(b%2!=0)
   {        
    res*=t;
    res%=10;
            }  
   t=t*t;
   t%=10;
   b/=2;  
        }    
  printf("%d\n",res); 
    }
   }   

#include <iostream> 
#include <cstdio>
using namespace std;
int main() 
{     
 long long a, b;     
 int ans[5];     
 while(cin >> a >> b)     
 {         
  if( b == 0 )         
  {             
   cout << "1" << endl;             
   continue;         
}          else if( a == 0 )         
  {             
 cout << "0" << endl;             
 continue;         
}        
 ans[1] = a % 10;         
 ans[2] = (ans[1] * a ) % 10;         
 ans[3] = (ans[2] * a ) % 10;         
 ans[4] = (ans[3] * a ) % 10;           
 int tmp = b % 4;         
 if( tmp == 0 ) tmp = 4;         
 cout << ans[tmp] << endl;     
}     
 return 0; 
}