[nono-92]

1cm , 2cm , 4cm
1kilo, give 1cm
2kilo , take 1cm and give 2cm
3k, give 1cm , 2+1=3
4k, take 1cm & 2cm give 4cm
5k , give 1cm , 4+1=5cm
6k , take 1cm and give 2cm, 4+2=6cm
7k, give 2cm , 4+1+2=7cm