#include <iostream>
using namespace std;

#define MIN(a,b) ((a)<(b)?(a):(b))
#define MAX(a,b) ((a)>(b)?(a):(b))

int main()
{
	int i, min = 100, max = 0, s = 0, t;
	for (i = 0; i < 6; i++) {
		cin >> t;
		min = MIN(min, t);
		max = MAX(max, t);
		s += t;
	}
	s -= min + max;
	s *= 25;
	printf("%d.%02d\n", s / 100, s % 100);

	return 0;
}