what the indentation for the python code to run?

def decibel_test(distance, timber_loss):

"""calculate the loss in decibels over a pre determined distance"""

unique_number = 1.01993

rain_loss = 1.5

atmospheric_loss = rain_loss * distance

decibel_loss = timber_loss + atmospheric_loss

total_loss = decibel_loss * unique_number

return total_loss

print('distance in km')

distance=float(input())

print('wood in metres')

timber_loss = 90 * float(input())

DB_loss=decibel_test(distance,timber_loss)

print('the total decibel loss is', DB_loss)