#!/usr/bin/env python
# 2021 - Advent Of Code 1 - part 2


count = 0

with open('input.txt') as f:
    n2_value = int(f.readline())
    n1_value = int(f.readline())
    n_value = int(f.readline())
    previous_sum = n2_value + n1_value + n_value

    for line in f:
        n2_value = n1_value
        n1_value = n_value
        n_value = int(line)
        current_sum = n2_value + n1_value + n_value

        if current_sum > previous_sum:
            count += 1
        previous_sum = current_sum

print(f'count: {count}')