counter=0
for file in 06-10-21-roundhouse-skalanes-without-GCP-images/*
do 
	# file_root=$(basename $file ".JPG"); 
	# echo $file_root; 
	if [ $((counter%4)) -eq 0 ]
	then 
		echo "copying $file"
		cp $file 06-10-21-roundhouse-skalanes-without-GCP-quarter-images/
	fi;
	counter=$counter+1
done