Convert Number to Circa Number

if(
    greaterOrEquals(int(div(outputs('Input_Number'), 1000)), 1),
    concat(
        'C.',
        div(outputs('Input_Number'), 1000),
        '.',
        substring(string(div(mod(outputs('Input_Number'), 1000), 100)), 0, 1),
        'K'
    ),
    concat('C.', string(outputs('Input_Number')))
)