#/bin/bash
ans=0
for i in {1..4}; do
        let idot16=$i*16
        dd if=/dev/sda of=MBR skip=$(expr 446 + $idot16) bs=1 count=16 > /dev/null 2> /dev/null
        s=$(<MBR)
        if [[ ${s// //} ]]; then
                ans=$(expr $ans + 1)
        fi
done
echo $ans
rm -f MBR