# -*- coding: utf-8 -*-
Aw, Ab = map(int, raw_input().split())
Bw, Bb = map(int, raw_input().split())
C, D = map(int, raw_input().split())
# A to B
if C <= Ab:
    Bb += C
else:
    Bb += Ab
    Aw -= C - Ab
    Bw += C - Ab
# B to A
if D <= Bw:
    Aw += D
else:
    Aw += Bw
print Aw