import sys; input = sys.stdin.buffer.readline
sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 10 ** 9 + 7; INF = float("inf")
import copy
import itertools

def getlist():
	return list(map(int, input().split()))

#処理内容
def main():
	A = getlist()
	seq = [0, 1, 2, 3, 4]
	P = list(itertools.permutations(seq, 5))
	ans = 0
	N = len(P)
	for i in range(N):
		val = 0
		B = copy.copy(A)
		s = P[i]
		for j in range(5):
			itr = s[j]
			m = min(B[(itr - 1) % 5], B[itr % 5], B[(itr + 1) % 5])
			B[(itr - 1) % 5] -= m
			B[itr % 5] -= m
			B[(itr + 1) % 5] -= m
			val += m

		ans = max(ans, val)

	print(ans)

if __name__ == '__main__':
	main()