function   [S1,J1,P1,S2,J2,P2]= Echange(S1,J1,P1,S2,J2,P2,Qui)
%UNTITLED5 Summary of this function goes here
%   Detailed explanation goes here

if (Qui == 1)
    if (P1 == 0)
        P1 = 15;
    else
        if (P1 == 15)
            P1 = 30;
        else
            if (P1 == 30)
                P1 = 40;
            else
                if ( (P2 == 40) && (P1 == 40))
                    P1 = 50;
                else
                    
                    if ( ((P1 == 40) && (P2 < 40)) || ((P1 == 50) && (P2 == 40)) )
                        P1 = 0;
                        P2 = 0;
                        J1 = J1 + 1
                        if ( (J1 >= 6) && ((J1-J2) > 1) )
                            S1 = S1 + 1;
                            J1 = 0;
                            J2 = 0;
                        end
                    else
                        P1 = 40;
                        P2 = 40;
                    end
                end
            end
        end
    end
else
    if (P2 == 0 )
        P2 = 15
    else
        if (P2 == 15)
            P2 = 30;
        else
            if (P2 == 30)
                P2 = 40;
            else
                if ((P1 == 40) && (P2 == 40))
                    P2 = 50;
                else
                    if ( ((P2 == 40) && (P1 < 40)) || ((P2 == 50) && (P1 == 40)) )
                        P1 = 0;
                        P2 = 0;
                        J2 = J2 + 1;
                        if ( (J2 >= 6) && ((J2-J1) > 2) )
                            S2 = S1+1;
                            J1 = 0;
                            J2 = 0;
                        end
                    else
                        P1 = 40;
                        P2 = 40;
                    end
                end
            end
        end
    end
    
    
end