diff --git a/partitions.sh b/partitions.sh
index 0b6c12e..5043f8a 100644
--- a/partitions.sh
+++ b/partitions.sh
@@ -5,7 +5,7 @@ MEM=`free -m | grep "Mem:" | awk -F' '  '{print $2}'| sed 's/m//'`
 #trouver la taille du disque sda
 DISK=`fdisk -l | grep sda  | awk -F' '  '{print $3}'`
 SDA="$DISK"000
-SDA1=$(("$SDA"-"$MEM"))
+SDA1=$(($SDA-$MEM))
 
 # Partitioner ! 
 (
@@ -23,4 +23,4 @@ echo   			# default, extend partition to end of disk
 echo a 			# make a partition bootable
 echo 1 			# bootable partition is partition 1 -- /dev/sda1
 echo w 			# Write changes
-) | sudo fdisk
\ No newline at end of file
+) | sudo fdisk /dev/sda
\ No newline at end of file