n1, n2, n3, n4, n5 = map(int, input().split())
res = n5
res += n4
if n1 > n4: # n1 -- скільки дощок 1 УСЕ_ЩЕ(!) потрібно
n1 -= n4
else:
n1 = 0
res += n3
if n2 >= n3:
n2 -= n3
else:
n3 -= n2
n2 = 0
n1 -= 2*n3 # n2 гарантовано додатне
#print(n1, n2, n3, n4, n5)
#print(res)
if n2>0:
res += n2//2
n1 -= n2//2
n2 %= 2 # лише або 1 або 0
#print(n1, n2, n3, n4, n5)
#print(res)
if n2>0: # лише 1
res += 1
n1 -= 3
#print(n1, n2, n3, n4, n5)
#print(res)
if n1>0:
if n1%5==0:
res += n1//5
else:
res += n1//5 + 1
print(res)
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