import itertools
import copy
a=list(map(int,input().split()))

w=[[0,1,2],[1,2,3],[2,3,4],[0,3,4],[0,1,4]]
ans1=[]
for x in range(len(w)):
    ans=0
    e=copy.copy(a)
    p=w[x][0]
    q=w[x][1]
    r=w[x][2]
    min_1=min(e[p],e[q],e[r])
    e[p]=e[p]-min_1
    e[q]=e[q]-min_1
    e[r]=e[r]-min_1
    ans+=min_1
    for y in range(len(w)):
        pp=w[y][0]
        qq=w[y][1]
        rr=w[y][2]
        min_2=min(e[pp],e[qq],e[rr])
        e[pp]=e[pp]-min_2
        e[qq]=e[qq]-min_2
        e[rr]=e[rr]-min_2
        ans+=min_2
        for z in range(len(w)):
            ppp=w[z][0]
            qqq=w[z][1]
            rrr=w[z][2]
            min_3=min(e[ppp],e[qqq],e[rrr])
            e[ppp]=e[ppp]-min_3
            e[qqq]=e[qqq]-min_3
            e[rrr]=e[rrr]-min_3
            ans+=min_3
            
            ans1.append(ans)
        
    
print(max(ans1))