A = [int(i) for i in input().split()]
B = [int(i) for i in input().split()]
C,D = [int(i) for i in input().split()]
while C > 0:
    if A[1] >= 1:
        A[1] -= 1
        B[1] += 1
    else:
        A[0] -= 1
        B[0] += 1
    C -= 1
while D > 0:
    if B[0] >= 1:
        A[0] += 1
        B[0] -= 1
    else:
        A[1] += 1
        B[1] -= 1
    D -= 1
print(A[0])