import sys
sys.setrecursionlimit(5*10**5)
input = sys.stdin.readline
from collections import defaultdict, deque, Counter
from heapq import heappop, heappush
from bisect import bisect_left, bisect_right
from math import gcd

a,b,o,w = map(int,input().split())
ans = 0
if o >= 1:
    ans += o
    ans += max(a,b) + w
else:
    ans += max(a,b)+w
print(ans)