B"Consider infinite grid of unit cells. Some of those cells are planets. Meta-universe M xe2 x80 x89= xe2 x80 x89{p1, xe2 x80 x89p2, xe2 x80 x89..., xe2 x80 x89pk} is a set of planets. Suppose there is an infinite row or column with following two properties: 1) it doesn't contain any planet pi of meta-universe M on it; 2) there are planets of M located on both sides from this row or column. In this case we can turn the meta-universe M into two non-empty meta-universes M1 and M2 containing planets that are located on respective sides of this row or column. A meta-universe which can't be split using operation above is called a universe. We perform such operations until all meta-universes turn to universes. Given positions of the planets in the original meta-universe, find the number of universes that are result of described process. It can be proved that each universe is uniquely identified not depending from order of splitting. The first line of input contains an integer n, (1 xe2 x80 x89 xe2 x89 xa4 xe2 x80 x89n xe2 x80 x89 xe2 x89 xa4 xe2 x80 x89105), denoting the number of planets in the meta-universe. The next n lines each contain integers xi and yi, ( xe2 x80 x89- xe2 x80 x89109 xe2 x80 x89 xe2 x89 xa4 xe2 x80 x89xi, xe2 x80 x89yi xe2 x80 x89 xe2 x89 xa4 xe2 x80 x89109), denoting the coordinates of the i-th planet. All planets are located in different cells. Print the number of resulting universes. The following figure describes the first test case:"...