#include <algorithm>
#include <iostream>
#include <numeric>
#include <string>
#include <tuple>
#include <utility>
#include <vector>
#include <limits>

#define rep(i, a, b) for (int i = int(a); i < int(b); i++)
using namespace std;
using ll = long long int;  // NOLINT
using P = pair<ll, ll>;

// clang-format off
#ifdef _DEBUG_
#define dump(...) do{ cerr << __LINE__ << ":\t" << #__VA_ARGS__ << " = "; debug_print(__VA_ARGS__); } while(false)
template<typename T, typename... Ts> void debug_print(const T &t, const Ts &...ts) { cerr << t; ((cerr << ", " << ts), ...); cerr << endl; }
#else
#define dump(...) do{ } while(false)
#endif
template<typename T> vector<T> make_v(size_t a, T b) { return vector<T>(a, b); }
template<typename... Ts> auto make_v(size_t a, Ts... ts) { return vector<decltype(make_v(ts...))>(a, make_v(ts...)); }
template<typename T> bool chmin(T &a, const T& b) { if (a > b) {a = b; return true; } return false; }
template<typename T> bool chmax(T &a, const T& b) { if (a < b) {a = b; return true; } return false; }
template<typename T, typename... Ts> void print(const T& t, const Ts&... ts) { cout << t; ((cout << ' ' << ts), ...); cout << '\n'; }
template<typename... Ts> void input(Ts&... ts) { (cin >> ... >> ts); }
template<typename T> istream &operator,(istream &in, T &t) { return in >> t; }
struct Inf { template<typename T> constexpr operator T() { return numeric_limits<T>::max() / 2; } };
// clang-format on

template<ll MOD>
class ModInt {
    ll n;
    auto constexpr inverse() const {
        return this->pow(*this, this->mod - 2);
    }

public:
    constexpr static ll mod = MOD;
    using mint = ModInt<MOD>;

    constexpr ModInt() : n(0) {}
    constexpr ModInt(const ll &nn) : n(((nn % MOD) + MOD) % MOD) {}
    constexpr mint operator+=(const mint &m) {
        n += m.n;
        if (n >= mint::mod) n -= mint::mod;
        return *this;
    }
    constexpr mint operator-=(const mint &m) {
        n -= m.n;
        if (n < 0) n += mint::mod;
        return *this;
    }
    constexpr mint operator*=(const mint &m) {
        n *= m.n;
        if (n >= mint::mod) n %= mint::mod;
        return *this;
    }
    constexpr mint operator/=(const mint &m) {
        return (*this) *= m.inverse();
    }
    friend constexpr mint operator+(mint t, const mint &m) {
        return t += m;
    }
    friend constexpr mint operator-(mint t, const mint &m) {
        return t -= m;
    }
    friend constexpr mint operator*(mint t, const mint &m) {
        return t *= m;
    }
    friend constexpr mint operator/(mint t, const mint &m) {
        return t /= m;
    }
    constexpr mint operator=(const ll &l) {
        n = l % mint::mod;
        if (n < 0) n += mint::mod;
        return *this;
    }
    friend ostream &operator<<(ostream &out, const mint &m) {
        out << m.n;
        return out;
    }
    friend istream &operator>>(istream &in, mint &m) {
        ll l;
        in >> l;
        m = l;
        return in;
    }
    static constexpr auto pow(const mint &x, ll p) {
        mint ans = 1;
        for (auto m = x; p > 0; p /= 2, m *= m) {
            if (p % 2) ans *= m;
        }
        return ans;
    }
    constexpr ll get_raw() const {
        return n;
    }
};
using mint = ModInt<998244353>::mint;
constexpr mint operator"" _m(unsigned long long m) {
    return mint(m);
}

mint sum(ll l, ll r) {
    if (l > r) return 0;
    return (3_m + r - l) * (2_m + r - l) * (1_m + r - l) / 6;
}

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    ll l, r;
    cin, l, r;
    ll a, b, c;
    cin, a, b, c;
    if (l + a + b > r || l + c > r) {
        print(0);
        return 0;
    }
    mint ans = sum(l + a + b, r);
    dump(ans);
    if (a + b < c) {
        // x <= r - c
        ans -= 1_m * (c - a - b + 1_m) * (0_m + c - a - b) * (r - l - c + 2_m) / 2_m;
        // x > r - c
        ans -= (c - a - b + 1_m) * (0_m + c - a - b) * (c - a - b - 1_m) / 6_m;
    }

    print(ans);

    return 0;
}