#include <stdio.h>
#define DEBUGe

#define NOP do{}while(0)

#ifdef DEBUG
#define TRACE(...) do{printf(__VA_ARGS__);fflush(stdout);}while(0)
#define TRACECR do{printf("\n");fflush(stdout);}while(0)
#else
#define TRACE(...) NOP
#define TRACECR NOP
#endif
//#define MOD    (1000000007)
#define MOD    (10)

int main( void ) {
    long    aa;
    long    bb;
    long    cc;

    scanf("%ld", &aa );
    scanf("%ld", &bb );
    if( bb == 0 ) {
        printf("%d\n", 0);
        return 0;
    } else if( bb == 1 ) {
        printf("%d\n", aa % 10);
        return 0;
    }
    aa %= 10;
    bb %= 4;
    cc = aa;
    for(int i = 1; i < bb; i++) {
        cc = (cc * aa) %10;
    }
    cc %= 10;
    printf("%d\n", cc);
    return 0;
}