Function to calculate the sum of numbers divisible by X or Y
def sum ( N , X , Y ) : NEW_LINE INDENT S1 = floor ( floor ( N / X ) * floor ( 2 * X + floor ( N / X - 1 ) * X ) / 2 ) NEW_LINE S2 = floor ( floor ( N / Y ) ) * floor ( 2 * Y + floor ( N / Y - 1 ) * Y ) / 2 NEW_LINE S3 = floor ( floor ( N / ( X * Y ) ) ) * floor ( 2 * ( X * Y ) + floor ( N / ( X * Y ) - 1 ) * ( X * Y ) ) / 2 NEW_LINE return S1 + S2 - S3 NEW_LINE DEDENT