#include <stdio.h>
#include <math.h>
int main()
{
float sum = 0;
int grade [7] = {0};
scanf("%d %d %d %d %d %d %d",&grade[0],&grade[1],&grade[2],&grade[3],&grade[4],&grade[5],&grade[6]);
//冒泡排序 决出最大值最小值
for(int i = 0; i < 6; i++)
{
for (int j = 0; j < 6 - i; j++)
{
if (grade[j] > grade[j+1])
{
int temp = grade[j];
grade[j] = grade[j+1];
grade[j+1] = temp;
}
}
}
for (int i = 1; i < 6; i++)
{
sum += grade[i];
}
double pin = sum / 5.0;
printf("%.2lf",pin);
return 0;
}