Seven children ABCDEFG started walking from the same point at the same time with speeds 1:2:3:4:5:6:7 respectively and they were running around a circular park. Each of them carried flags of different colours. Whenever two or more children meet, they place their respective flags at that point. However, nobody places more than 1 flag at the same point. They are rubbing in an anticlockwise direction. How many flags will there in total, when there will be no scope of putting more flags?