import sys
input = sys.stdin.readline

a1, a2, a3, b = map(int, input().split())
a = [a1, a2, a3]

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 == 0 and j == 1 and k == 2):
                damage += b
            if(ans >= damage):
                continue
            ans = damage
print(ans)