Four different radioactive elements are kept in separated containers. In the beginning the container `A` has `200 g`-atom with half-life of `2` days, `B` has `20 g`-atom with half-life of `20` days, `C` has `2g`-atom with half-life `200` days and `D` has `100g`-atoms wityh half-life of `10` days. In the begining the maximum activity exhibited by the container is