#include<iostream> #include<iomanip> #include<climits> using namespace std; int main(){ int n,m; cin>>n>>m; double max_score=0.0; for(int i=0;i<n;i++){ int sum=0; int max_num=0; int min_num=10; int score; for(int j=0;j<m;j++){ cin>>score; sum+=score; if(score>max_num)max_num=score; if(score<min_num)min_num=score; }double final_s=(sum-max_num-min_num)*1.0/(m-2); if(final_s>max_score){ max_score=final_s; } }cout<<fixed<<setprecision(2)<<max_score<<endl; return 0; }