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#!/bin/sh
[ "$#" = 1 ] || {
printf "usage: %s inputfile\n" "$0" >&2
exit 1
}
max=0
cur=0
while read -r line; do
case "$line" in '')
[ "$cur" -gt "$max" ] && max="$cur"
cur=0
;;
[0-9]*)
printf "%d\n" "$line" >/dev/null 2>&1 || {
printf "%s is not a number\n" "$line" >&2
exit 1
}
cur=$((cur + line))
;;
*)
printf "%s is not a number\n" "$line" >&2
exit 1
;;
esac
done < "$1"
[ "$cur" -gt "$max" ] && max="$cur"
printf "%d\n" "$max"
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