# -*- coding: utf-8 -*-
def func1(Pos1, Pos2, Length):
    Delta = Pos2 - Pos1;
    j = Pos2;
    p1 = Pos1;
    p2 = Pos2;
    Step = 0;
    SubStep = 0;
    while (Step < Delta + Length):
        Step = Step + 1;
        SubStep = SubStep + 1;
        print(" %d → Buffer"%j);
        print(" %d → %d"%(p1,j));
        while 1:
            Step = Step + 1;
            if (j + Delta < Pos2 + Length):
                j = j + Delta;
            else:
                j = j - Length;
            print(" Buffer ↔ %d"%(j));
            if (j == p1):
                p1 = p1 + 1;
                p2 = p2 + 1;
                j = p2;
                break;
    return SubStep;