Explanation
The Roman numerals are represented by the following letters:
I = 1
V = 5
X = 10
L = 50
C = 100
D = 500
M = 1000
If a numeral is followed by another numeral of lower denomination, the two are added together;
if it is preceded by one of lower denomination, the smaller numeral is subtracted from the greater.
$$I = 1$$
$$V = 5$$
$$X = 10$$
$$L = 50$$
$$C = 100$$
$$D = 500$$
$$M = 1000$$
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