public class radian {
	public static void median(int n,int ai[]){
	    if(n%2==1){
	    	System.out.println((double)ai[(n + 1) / 2 - 1]);
	    }
	    else{
	    	System.out.println((double)(ai[n / 2] + ai[n / 2 - 1])/2);
	    }
	}
	public static void main(String args[]){
		int ai[] = new int[2];
		ai[0] = 4;
		ai[1] = 7;
		median(2, ai);
	}
}