L=sorted(map(int,input().split()))
c=L[0]
L=[i-c for i in L]
m=min(L[2]-L[1],L[1]*2)//2
L=sorted([m,L[1],L[2]-m*2])
if min(L)==L[0]:
	c+=L[0]
	L=[i-L[0] for i in L]
m=L[1]//2
m-=m%2
L=[m,L[1]-m,L[2]-m]
c+=L[0]
L=[i-m for i in L]
if L[2]>5:
	while L[2]>5:c+=1;L[2]-=5
elif L[2]>2:c+=1
print(c)