How many longitudes can be drawn on a world map keeping an interval of 1° each?

In total there can be 360 longitudinal degrees possible. This is because of the shape of our earth which is quite a circle and in a circle, there are 360 degrees. But when we flatten out the map to a piece of paper, we add the fence post problem. Now there are 361 longitude lines on the paper, but two of them are the same line, the 180-degree line which would appear on each side of the map. Hence there are 360 longitudinal lines.