Write the Hindu-Arabic numeral for the Roman numeral: $\mathrm{XLI}$

Write the following Hindu-Arabic numeral for the following Roman numeral:

$\mathrm{DXCVII}$

Write the following Hindu-Arabic numeral for the following Roman numeral:

$\mathrm{DCLXXV}$

Write the following Hindu-Arabic numeral for the following Roman numeral:

$\mathrm{DCCCLXXXVIII}$

Write the following Hindu-Arabic numeral for the following Roman numeral:

$\mathrm{MDXXXIV}$