#!/bin/bash

i_max=-1
j_max=0
locations=()
marked_locations=()
while read line; do
  if [ $i_max -lt 0 ]; then
    i_max=${#line}
  fi
  locations+=( $(sed 's/\([0-9]\)/\1 /g' <<< $line) )
  j_max=$((j_max+1))
done
for i in $(seq 0 $((i_max-1))); do
  for j in $(seq 0 $((j_max-1))); do
    marked_locations+=( 0 )
  done
done

for i in $(seq 0 $((i_max-1))); do
  for j in $(seq 0 $((j_max-1))); do
    curr_location=${locations[$((i+j*i_max))]}
    if [ $curr_location -ne 9 ]; then
      marked_locations[$((i+j*i_max))]=$((marked_locations[i+j*i_max]+1))
      curr_i=$i
      curr_j=$j
      curr_min=$curr_location
      min_found=0
      while [ $min_found -eq 0 ]; do
        if [ $curr_i -gt 0 ] && [ ${locations[$((curr_i-1+curr_j*i_max))]} -lt $curr_min ]; then
          marked_locations[$((curr_i-1+curr_j*i_max))]=$((marked_locations[curr_i+curr_j*i_max]+marked_locations[curr_i-1+curr_j*i_max]))
          marked_locations[$((curr_i+curr_j*i_max))]=0
	  curr_min=${locations[$((curr_i-1+curr_j*i_max))]}
	  curr_i=$((curr_i-1))
        elif [ $curr_j -gt 0 ] && [ ${locations[$((curr_i+(curr_j-1)*i_max))]} -lt $curr_min ]; then
	  marked_locations[$((curr_i+(curr_j-1)*i_max))]=$((marked_locations[curr_i+curr_j*i_max]+marked_locations[curr_i+(curr_j-1)*i_max]))
          marked_locations[$((curr_i+curr_j*i_max))]=0
	  curr_min=${locations[$((curr_i+(curr_j-1)*i_max))]}
	  curr_j=$((curr_j-1))
        elif [ $curr_i -lt $((i_max-1)) ] && [ ${locations[$((curr_i+1+curr_j*i_max))]} -lt $curr_min ]; then
          marked_locations[$((curr_i+1+curr_j*i_max))]=$((marked_locations[curr_i+curr_j*i_max]+marked_locations[curr_i+1+curr_j*i_max]))
          marked_locations[$((curr_i+curr_j*i_max))]=0
	  curr_min=${locations[$((curr_i+1+curr_j*i_max))]}
	  curr_i=$((curr_i+1))
        elif [ $curr_j -lt $((j_max-1)) ] && [ ${locations[$((curr_i+(curr_j+1)*i_max))]} -lt $curr_min ]; then
          marked_locations[$((curr_i+(curr_j+1)*i_max))]=$((marked_locations[curr_i+curr_j*i_max]+marked_locations[curr_i+(curr_j+1)*i_max]))
          marked_locations[$((curr_i+curr_j*i_max))]=0
	  curr_min=${locations[$((curr_i+(curr_j+1)*i_max))]}
	  curr_j=$((curr_j+1))
	else
	  min_found=1
        fi
      done
    fi
  done
done

sizes=( $(printf '%s\n' "${marked_locations[@]}" | sort -nr) )
echo $((sizes[0]*sizes[1]*sizes[2]))