MOD = 998244353
l, r = map(int, input().split())
r -= l - 1
a, b, c = map(int, input().split())
if a + b >= r or c >= r:
    print(0)
elif a + b >= c:
    p = r - a - b + 2
    print((p * (p - 1) * (p - 2) // 6) % MOD)
else:
    r -= 1
    b += a
    print(((r + 2 - c) * (r + 1 - c) * (r + 3 + 2 * c - 3 * b) // 6) % MOD)