import numpy as np
import re
import sys

f = open(sys.argv[1],"r")
cords=[]

llist=[]

for line in f:
    if re.search("^[0-9]",line.rstrip()):
        for i in line.rstrip().split(' -> '):
            llist.append(i.rstrip().split(','))


max_x = 0
max_y = 0
for i in llist:
    if int(i[0]) > max_x:
        max_x = int(i[0])
    
    if int(i[1]) > max_y:
        max_y = int(i[1])
    
#field = np.zeros((int(max_y)+1,int(max_x)+1))
field = np.zeros((1000,1000))

for i in range(0,len(llist)-1,2):
    x = int(llist[i][0])
    y = int(llist[i][1])
    
    X = int(llist[i+1][0])
    Y = int(llist[i+1][1])
    #print('Compare ' + str(x)+','+str(y)+' and '+ str(X) + ',' + str(Y))
    if x != X and y == Y:
        if x > X: 
            temp = x
            x = X
            X = temp
        print('X: Going from ' + str(x) + ' to ' + str(X))
        for j in range(x,X+1):
            field[y][j] += 1
        #print(field)
    if y != Y and x == X:
        print('Y: Going from ' + str(y) + ' to ' + str(Y))
        if y > Y: 
            temp = y
            y = Y
            y = temp
        for j in range(y,Y+1):
            field[j][x] += 1
        #print(field)

count = 0

for i in field:
    for j in i:
        if int(j) >= 2: count+=1

print(count)