import sys
readline=sys.stdin.readline

*A,B=map(int,readline().split())
ans=0
for i in range(3):
    for j in range(3):
        for k in range(3):
            damage=A[i]+A[j]+A[k]
            if (i,j,k)==(0,1,2):
                damage+=B
            ans=max(ans,damage)
print(ans)