import std.array, std.stdio, std.string, std.algorithm, std.conv;
import std.bigint;

void main()
{
    BigInt N = readln.strip().to!BigInt;
    BigInt M = readln.strip().to!BigInt;

    if (M == 0) writeln(1);
    else {
        writeln(N ^^ ((M - 1) % 4 + 1) % 10);
    }
}