import sys; input = sys.stdin.buffer.readline
sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 10 ** 9 + 7; INF = float("inf")

def getlist():
	return list(map(int, input().split()))

#処理内容
def main():
	Aw, Ab = getlist()
	Bw, Bb = getlist()
	C, D = getlist()
	if C <= Ab:
		Bb += C
		Ab -= C
	else:
		Bb += Ab
		Aw -= C - Ab
		Bw += C - Ab
		Ab = 0

	if Bw <= D:
		Aw += Bw
	else:
		Aw += D

	print(Aw)

	
if __name__ == '__main__':
	main()