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

public class Main {

    public static void main(String[] args) {
	// write your code here
        BigDecimal a = new BigDecimal(40);
        BigDecimal b = new BigDecimal(60);
        System.out.println(a.divide(b,2, RoundingMode.HALF_UP));
    }
}