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


void main()
{
    char n = readln.strip[$];
    string m = readln.strip[$-2 .. $];
    int N = n.to!int;
    int M = m.to!int;

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