#!/bin/python3
import sys,re
from pprint import pprint
sys.path.insert(0, '../../')
from fred import list2int,get_re,nprint,lprint

input_f = 'input'

part = 2
#########################################
#                                       #
#              Part 1                   #
#                                       #
#########################################

def checkInc(line:list):
    safe = False
    for i in range(0,len(line)-1):
        if line[i] < line[i+1]:
            safe = True  
        else:
            return False
    return safe

def checkDesc(line:list):
    safe = False
    for i in range(0,len(line)-1):  
        if line[i] > line[i+1]:
            safe = True
        else:
            return False
    return safe

def checkJump(line:list):
    safe = False
    for i in range(0,len(line)-1):
        if abs(line[i] - line[i+1]) in [1,2,3]:
            safe = True  
        else:
            return False
    return safe


if part == 1:
    reports = []
    count = 0
    with open(input_f) as file:
        for line in file:
            reports.append(list2int(line.rstrip().split()))

    for r in reports:
        if (checkDesc(r) or checkInc(r)) and checkJump(r):
            count += 1
    print(count)



#########################################
#                                       #
#              Part 2                   #
#                                       #
#########################################
if part == 2:
    reports = []
    count = 0
    j = 0
    with open(input_f) as file:
        for line in file:
            reports.append(list2int(line.rstrip().split()))

    for rdx,r in enumerate(reports):
        if (checkDesc(r) or checkInc(r)) and checkJump(r):
            count += 1
        else:
            secondSafe = False
            while not secondSafe:
                tmp = r[:j] + r[j + 1:]
                if (checkDesc(tmp) or checkInc(tmp)) and checkJump(tmp):
                    count += 1
                    secondSafe = True
                
                if not secondSafe and j > len(tmp)-1:
                    break
                j += 1
            j = 0
            secondSafe = False
                
    print(count)