package jsk;import java.util.Scanner;public class Main23 {	private static Scanner input;	public static void main(String[] args) {		//两组升序排列的数组A[m]和B[n],求他们的中位数		input = new Scanner(System.in);		int m = input.nextInt();		int [] array1 =new int[m];		init(array1);		int n = input.nextInt();		int [] array2 = new int[n];		init(array2);		//把这两个数组合并起来		mearge(array1,array2);	}	private static void init(int [] array) {		for (int i =0;i<array.length;i++) {			array[i] = input.nextInt();		}	}	public static void mearge(int[]array1,int[]array2){		int p1 = array1.length-1;		int p2 = array2.length-1;		//循环遍历array1,array2,然后合并起来		int newLength = array1.length+array2.length-1;		int [] newArray = new int[newLength+1];		while (p1 >= 0 && p2 >= 0) {//二者长度相等部分			if (array1[p1] >= array2[p2]) {				newArray[newLength] = array1[p1];				p1--;				newLength--;			} else {				newArray[newLength] = array2[p2];				newLength--;				p2--;			}		}		//假设a数组多出来		while (p1 >=0) {			newArray[newLength] = array1[p1];			newLength--;			p1--;					}		//假设b数组多出来		while (p2 >=0) {			newArray[newLength] = array2[p2];			newLength--;			p2--;		}		//求中位数,如果这这个中位数是奇数的，直接取中间的数，如果是偶数的话取中间减一，加一两个数的平均数		if (newArray.length%2 == 1) {			System.out.println(newArray[newArray.length/2+1]);		}else{			int number1 = newArray[newArray.length/2];			int number2 = newArray[newArray.length/2-1];			System.out.printf("%.5f",(double)(number1+number2)/2);		}					}	}