Two cars start from place $A$ and $B$, $100 \mathrm{kms}$ apart, towards each other. Both cars start simultaneously. A bird sitting on one car starts at the same time towards the other car, and as soon as it reaches the second car, it flies back to the first car and it continues in this manner flying backwards and forwards from one car to the other until the cars meet. Both cars travel at a speed on $50 \mathrm{kmph}$ and the bird flies at $100 \mathrm{kmph}$. Total distance covered by the bird will be —