#include #define FOR(i,a,b) for(int i=(a);i<(b);i++) #define REP(i,b) FOR(i,0,b) #define ALL(c) c.begin(),c.end() #define PB push_back #define TT second.second #define SS second.first #define FF first using namespace std; typedef long double ld; typedef long long LL; typedef double ut; typedef vector VI; typedef pair pr; typedef pair ppr; typedef vector Vpr; typedef priority_queue > PQ; const int INF=1<<30; const int BITSIZE=1<<12; const int SIZE=10+2*1e4; int main(){ ld mini=INF,maxim=0,sum=0,n=0; REP(i,6){ cin >> n; sum+=n; mini=min(mini,n); maxim=max(maxim,n); } printf("%.2f\n",(double)(sum-maxim-mini)/4); return 0; }