#include <stdio.h>
#include<math.h>
int main() {
int a, b,c,d,e,f,g,i;
double s;
int max(int x,int y);
int min(int x, int y);
while (scanf("%d %d %d %d %d %d %d", &a, &b,&c,&d,&e,&f,&g) != EOF)
{
int sum=a+b+c+d+e+f+g;
int m1=max(max(a,b),max(c,d));
int m2=max(max(e,f),g);
int ma=max(m1,m2);
int mi=min(g, min( min( min(a,b),min(c,d) ),min(e,f)));
s=(sum-ma-mi)/5.0;
printf("%.2lf\n",s);
}
return 0;
}
int max(int x ,int y)
{
int z;
if(x>y)
z=x;
else z=y;
return z;
}
int min(int x,int y)
{
int z;
if(x<y)
z=x;
else z=y;
return z;
}