#!/usr/bin/env python3
import sys, utils

def find_increasing_window(l: list):
    win = l[:3]  
    count = 0
    for n in range(4, len(l)+1):
        new_win = l[n-3:n]
        if sum(new_win) > sum(win):
            count += 1
        win = new_win
    return count

if __name__ == '__main__':
    if len(sys.argv) < 2:
        print("please supply input file")
        sys.exit()
    f = utils.File(sys.argv[1])
    print(find_increasing_window(f.get_ints()))