import java.math.BigDecimal;
import java.math.RoundingMode;

class Main
{
	public static void main(String[] args) throws java.lang.Exception
	{
		BigDecimal priceDiff = BigDecimal.ONE
			.subtract(new BigDecimal(9.99)
				.divide(new BigDecimal(19.99)))
			.multiply(new BigDecimal(100));
		System.out.println(priceDiff.toPlainString());
	}
}