#!/usr/bin/env bash

max1=0
max2=0
max3=0
c=0

while read a; do
  if [[ -n "$a" ]]; then
    let c+=$a
  else
    if [[ $c -gt $max1 ]]; then
      max3=$max2
      max2=$max1
      max1=$c
    elif [[ $c -gt $max2 ]]; then
      max3=$max2
      max2=$c
    elif [[ $c -gt $max3 ]]; then
      max3=$c
    fi
    c=0
  fi
done
 
echo $(( $max1 + $max2 + $max3 ))