2357

#include <iostream>#include <vector>#include <algorithm>const int MAX = 100;int a[MAX];using namespace std;int main(){int count;while(cin>>count){if(count == 0)break;for(int i=0; i<count; i++){cin>>a[i];}sort(a, a+count);if(count%2==0)cout<<(a[count/2-1]+a[count/2])*1.0/2<<endl;elsecout<<a[count/2]<<endl;}return 0;}