杭电1097

#include <stdio.h>int main (void){    __int64 a,b,c;    while(scanf("%I64d%I64d",&a,&b)!=EOF)    {        b%=4;a%=10;c=a;        if(b==0)        b=4;        while(--b)        c=c*a%10;        printf("%I64d\n",c);    }    return 0;}