Strange Antennas

Time Limit: 10 Seconds    Memory Limit: 131072 KB

A President wants to survey its country.  The  country's territory is  a grid of  n  x  n  cells. Every corner of each cell in the grid defines a point (indexed from 0 to n line and column-wise, 0< n <= 30000). At every point of the grid the President can install an antenna.

Such an antenna emits a signal in one of the four directions: South-East (SE), South-West (SW), North-East (NE), North-West (NW). The shape of the signal is an isosceles right triangle. Each of the two equal sides of the triangle represents the antenna's power (0< p <= 2*n). The triangle defines the coverage of the antenna in the grid.

The President has already installed a number of antennas (we call this number a, 0 <= a <= 100) and is interested in determining the total number of cells that are covered. But  these  antennas  are  strange,  because  in  any  cell,  if  the  signals  coming  from  two  antennas overlap, they cancel each other. In other words, for any given cell, the cell is going to be covered if and only if there is an odd number of signals overlapping  in that cell.

For instance, given the 10 by 10 grid, with points ranging from 0 to 10:

x x x x - - - - - -

x o o y y - - - - -

x x y y y - - - - -

x - - y y - - - - -

- - - - y - - - - -

- - - - - - - - - -

- - - - - - - - - -

- - - - - - - - - -

- - - - - - - - - -

- - - - - - - - - -

In  the  picture,  the  antenna  X  is  situated  on  line  0,  column  0, emitting  a  signal  of  power  4,  towards  South-East.  Antenna  Y  is  situated on line  1, column  5, emitting of power  4, towards  SouthWest. In the above case, there is a total of 16 cells covered.

Input

The  input  data  has  the  following  format:  the  number  of  cells  n  is  followed  by  the  number  of antennas  a,  each  on  a  separate  line.  The  next  a  lines,  for  each  antenna,  contain: 

line_position,  column_position,  power,  orientation,  each  on  a  separate  line.  The orientation is an integer in the range 0-3 (0:SW, 1:SE, 2:NE, 3:NW).

Output

The output should be the number of cells covered by the antennas.

Sample Input

10
2
0 0 4 1
1 5 4 0

Sample Output

16
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