#!/usr/bin/python3

from sys import exit

larger = 0
current = -1

three = []
counter = 1

zahlen = []

with open('input.txt', 'r') as myfile:
    # create a list from all lines
    for lines in myfile:
        zahlen.append(int(lines.strip()))
    
    laenge = len(zahlen)
    for i in range(laenge):
        # stop it, if end of list is reached
        if i + 2 >= laenge:
            break

        csum = zahlen[i] + zahlen[i+1] + zahlen[i+2]        
        print('{} :: {} + {} + {} =  {}'.format(i, zahlen[i],zahlen[i+1],zahlen[i+2], csum))
        three.append(csum)


for item in three:
    if current > -1:
        if item > current:
            print ('current: {} < {}'.format(current, item))
            larger = larger + 1
                    
    current = item
        

print('{} measurements are larger than the previous measurement'.format(larger))
exit