def f(P, Q, R):
    return (R*(R+1)*(2*R+1)//6 + (P+Q)*R*(R+1)//2+ P*Q*R) // 2

L, R = map(int, input().split())
A, B, C = map(int, input().split())

if C >= B+A:
    if L+C > R:
        print(0)
        quit()
    P, Q = C-L-2*A-2*B+2, -C-L+1
    ans = f(P, Q, R) - f(P, Q, L+C-1)
    ans %= 998244353
    print(ans)
else:
    if L+A+B > R:
        print(0)
        quit()
    P, Q = -B-L-A+1, -B-L-A+2
    ans = f(P, Q, R) - f(P, Q, L+A+B-1)
    ans %= 998244353
    print(ans)