diff --git a/avocado-preprocessing.sh b/avocado-preprocessing.sh
index 2967a76..80405b4 100755
--- a/avocado-preprocessing.sh
+++ b/avocado-preprocessing.sh
@@ -16,14 +16,14 @@ head -n -1 avocado-updated-2020.csv | shuf > avocado-updated-2020-shuf.csv
 
 head -n "$1" avocado-updated-2020-shuf.csv > avocado-2020.csv
 TRUNCATED_SIZE=$(wc -l avocado-2020.csv | awk '{print $1}')
-TEST_SIZE=0,2*$TRUNCATED_SIZE
-DEV_SIZE=2*0,2*$TRUNCATED_SIZE
-TRAIN_SIZE=2*0,2*$TRUNCATED_SIZE+1
+declare -i test_size=0,2*$TRUNCATED_SIZE
+declare -i dev_size=2*0,2*$TRUNCATED_SIZE
+declare -i train_size=2*0,2*$TRUNCATED_SIZE+1
 
 # podzial na train/dev/test 6/2/2
-head -n $TEST_SIZE avocado-2020.csv > avocado-updated-2020-test.csv
-head -n $DEV_SIZE avocado-2020.csv | tail -n $TEST_SIZE > avocado-updated-2020-dev.csv
-tail -n +$TRAIN_SIZE avocado-2020.csv > avocado-updated-2020-train.csv
+head -n $test_size avocado-2020.csv > avocado-updated-2020-test.csv
+head -n $dev_size avocado-2020.csv | tail -n $TEST_SIZE > avocado-updated-2020-dev.csv
+tail -n +$train_size avocado-2020.csv > avocado-updated-2020-train.csv
 
 wc -l avocado-updated-2020-*.csv