module count_4bit(
    input cin,
    output cout,
     output count [3:0]
    );
parameter timeconst = 60;//constant
integer count0;
integer count1;
integer count2;
integer count3;

reg d;
reg count;

initial d = 1'b0;



always @ (posedge cin)//begin
    begin
        count0 <= (count0 + 1);
        if ((count0 == timeconst))
            begin
                count <= 0;
                count1 <= (count1 +1);
            end
        else if ((count1 == timeconst))
            begin
                count1 <= 0;
                count2 <= (count2 + 1);
            end
        else if ((count2 == timeconst))
            begin
                count2 <= 0;
                count3 <= (count3 + 1);
            end
        else if ((count3 == timeconst))
            begin
                count3 <= 0;
                d <= ~ (d);
            end
    cout <= d;
end
endmodule