: Conversion of integers from base 16 to base 10

$\definecolor{red}{RGB}{255,0,0}$$\definecolor{black}{RGB}{0,0,0}$ : Conversion of integers from base 16 to base 10

Enter a number in base 16 (hexadecimal number) to convert it to base 10: ( a=10; b=11; c=12; d=13; e=14; f=15) :