#!/usr/bin/env awk

BEGIN {
  # Initialize number of lines counter
  safe = 0
}
{
  # Set initial order, 0 for asc, 1 for desc
  if ($2 > $1) {
    order = 0
  } else {
    order = 1
  }

  # Loop through items on each line
  for (i = 1; i < NF; i++) {
    j = i + 1
    k = i + 2

    # See if order is matched
    if ( $i < $j && order == 1 ) {
      if ( $i < $k && order == 1 ) {
        next
      }
    } else if ( $i > $j && order == 0) {
      if ( $i > $k && order == 0 ) {
        next
      }
    }

    # Get absolute diff value
    if ( $i < $j ) {
      diff = $j - $i
    } else { 
      diff = $i - $j
    }
    if ( $i < $k ) {
      diff2 = $k - $i
    } else { 
      diff2 = $i - $k
    }

    # Verify diff within parameters
    if (diff > 3 || diff < 1) {
      if (diff2 > 3 || diff2 < 1) {
        next
      }
    }

  }
  # If all pass, increment safe counter
  safe += 1
}
END {
  print safe
}