# Programmer: Sriram Pemmaraju
# Date: Feb 26th, 2013

# The program reads a file with nonnegative integers (in no pre-specified format)
# and reports the number of distinct nonnegative integers in the file.

# This function takes a string consisting of non-negative integers and
# returns a list containing all the integers in the line.
# The integers in the line are separated by 1 or more blanks.
def parse(s):
    listOfNumbers = [] # maintains the list of numbers in strings s
    currentNumber = ""
    
    # The function oscillates between two states: in one state 
    # it is processing the digits of an integer and the other state
    # it is processing the white spaces between consecutive integers.
    # The boolean variable numberBeingProcessed is used to keep track
    # of this state.
    numberBeingProcessed = False
    
    i = 0 # serves as an index into the string s
    while i < len(s):
        # if the current character is a digit
        if s[i] >= "0" and s[i] <= "9":
            numberBeingProcessed = True
            currentNumber = currentNumber + s[i]
        # else if the current character is a non-digit
        # immediately following a number
        elif numberBeingProcessed:
            listOfNumbers.append(int(currentNumber))
            numberBeingProcessed = False
            currentNumber = ""
        i = i + 1

    # Clean-up, if the last character of string s is a digit
    if numberBeingProcessed:
        listOfNumbers.append(int(currentNumber))

    return listOfNumbers

# Takes two lists L1 and L2 and returns the list obtained
# by appending to L1, all elements in L2 that are not in L1
def uniqueExtend(L1, L2):
    index = 0 # serves as index into list L2
    
    # Loop to walk through elements of L2
    while index < len(L2):
        # If current element of L2 is not in L1, then append it
        if not(L2[index] in L1):
            L1.append(L2[index])
        index = index + 1
            
    return L1

# Open a file called test.txt for read only and read the first line
f = open("test.txt", "r")
line = f.readline()
masterList = [] # keeps track of the list of distinct integers in the file

# Process each line, if line is non-empty
while line:
    # Parse the line to extract a list of numbers in the line
    numbersInLine = parse(line)
    
    # Extend the masterList by appending to it all the new
    # numbers in the line.
    masterList = uniqueExtend(masterList, numbersInLine)
    
    # Read the next line  
    line = f.readline()
    
f.close()

print len(masterList)