#include <bits/stdc++.h>
#if __has_include(<atcoder/all>)
#include <atcoder/all>
#endif

namespace ttl{

using namespace std;
using f80=long double;
using i64=int64_t;
using u64=uint64_t;

template<typename T> void Scan_(T& a){
  cin>>a;
}
template<typename T,typename U> void Scan_(pair<T,U>& a){
  Scan_(a.first),Scan_(a.second);
}
template<typename T> void Scan_(vector<T>& a){
  for(auto& v:a){
    Scan_(v);
  }
}
template<typename T> void Scan_(vector<vector<T>>& a){
  for(auto& v:a){
    for(auto& u:v){
      Scan_(u);
    }
  }
}
void Scan(){}
template<typename T,class... Args> void Scan(T& n,Args&... args){
  Scan_(n),Scan(args...);
}
template<typename T> void Print_(T a){
  cout<<a;
}
template<typename T,typename U> void Print_(pair<T,U> a){
  Print_(a.first),cout<<" ";Print_(a.second);
}
void Print_(f80 a){
  printf("%.10Lf",a);
}
template<typename T> void Print(vector<T> a){
  for(size_t i=0;i<a.size();++i){
    Print_(a[i]);
    cout<<" \n"[i==a.size()-1];
  }
}
template<typename T> void Print(vector<vector<T>> a){
  for(auto& v:a){
    for(size_t i=0;i<v.size();++i){
      Print_(v[i]);
      cout<<" \n"[i==v.size()-1];
    }
  }
}
template<typename T> void Print(T a){
  Print_(a);
  cout<<"\n";
}
template<typename T,class... Args> void Print(T a,Args... args){
  Print_(a),cout<<" ",Print(args...);
}

//しおむすびありがとう
template<class Head,class... Tail> struct MultiDimVec{
  using type=vector<typename MultiDimVec<Tail...>::type>;
};
template<class T> struct MultiDimVec<T>{
  using type=T;
};
template<class T,class Arg> vector<T> MakeVec(int n,Arg&& arg){
  return vector<T>(n,arg);
}
template<class T,class... Args> typename MultiDimVec<Args...,T>::type MakeVec(int n,Args&&... args){
  return typename MultiDimVec<Args...,T>::type(n,MakeVec<T>(args...));
}

template<typename T> T Sum(vector<T> a){
  return accumulate(a.begin(),a.end(),T(0));
}

template<typename T> T Rev_(T a){
  reverse(a.begin(),a.end());
  return a;
}
template<typename T> void Rev(T& a){
  reverse(a.begin(),a.end());
}

template<typename T> T Sort_(T a){
  sort(a.begin(),a.end());
  return a;
}
template<typename T> void Sort(T& a){
  sort(a.begin(),a.end());
}
template<typename T> T RSort_(T a){
  sort(a.rbegin(),a.rend());
  return a;
}
template<typename T> void RSort(T& a){
  sort(a.rbegin(),a.rend());
}

template<typename T> T Max(vector<T> a){
  return *max_element(a.begin(),a.end());
}

template<typename T> T Min(vector<T> a){
  return *min_element(a.begin(),a.end());
}

template<typename T> void ChMax(T& a,T b){
  a=max(a,b);
}

template<typename T> void ChMin(T& a,T b){
  a=min(a,b);
}

i64 Tr(i64 n){
  return n*(n+1)/2;
}

i64 PopCnt(u64 k){
  return __builtin_popcountll(k);
}

i64 SqrtF(i64 n){
  i64 ok=0,ng=1e9+5;
  while(std::abs(ok-ng)>1){
    i64 mid=(ok+ng)/2;
    (mid*mid<=n?ok:ng)=mid;
  }
  return ok;
}

i64 FDiv(i64 a,i64 b){
  if(b<0){
    a*=-1,b*=-1;
  }
  if(a<0){
    return -(-a+b-1)/b;
  }
  return a/b;
}

i64 CDiv(i64 a,i64 b){
  if(b<0){
    a*=-1,b*=-1;
  }
  if(a<0){
    return -(-a)/b;
  }
  return (a+b-1)/b;
}

template<u64 mod> struct ModInt{
  u64 val;
  ModInt(i64 val_=0):val((val_%i64(mod)+i64(mod))%i64(mod)){}
  ModInt operator-(){
    return (val==0)?0:mod-val;
  }
  ModInt operator+(ModInt rhs){
    return ModInt(*this)+=rhs;
  }
  ModInt operator-(ModInt rhs){
    return ModInt(*this)-=rhs;
  }
  ModInt operator*(ModInt rhs){
    return ModInt(*this)*=rhs;
  }
  ModInt operator/(ModInt rhs){
    return ModInt(*this)/=rhs;
  }
  ModInt pow(i64 rhs){
    ModInt res=1,now=(*this);
    while(rhs){
      res*=((rhs&1)?now:1),now*=now,rhs>>=1;
    }
    return res;
  }
  ModInt &operator+=(ModInt rhs){
    val+=rhs.val,val-=((val>=mod)?mod:0);
    return (*this);
  }
  ModInt &operator-=(ModInt rhs){
    val+=((val<rhs.val)?mod:0),val-=rhs.val;
    return (*this);
  }
  ModInt &operator*=(ModInt rhs){
    val=val*rhs.val%mod;
    return (*this);
  }
  ModInt &operator/=(ModInt rhs){
    return (*this)*=rhs.pow(mod-2);
  }
  bool operator==(ModInt rhs){
    return val==rhs.val;
  }
  bool operator!=(ModInt rhs){
    return val!=rhs.val;
  }
  friend std::ostream &operator<<(std::ostream& os,ModInt x){
    return os<<(x.val);
  }
  friend std::istream &operator>>(std::istream& is,ModInt& x){
    u64 t;
    is>>t,x=t;
    return is;
  }
};

vector<i64> LISSize(vector<i64> A){
  int N=A.size();
  vector<i64> dp(N+1,2e18),res(N+1);
  dp[0]=-1;
  for(int i=0;i<N;++i){
    auto j=(lower_bound(dp.begin(),dp.end(),A[i])-dp.begin())-1;
    dp[j+1]=A[i];
    res[i+1]=max(res[i],i64(j+1));
  }
  return res;
}

#if __has_include(<atcoder/all>)
i64 CountInverse(vector<i64> A){
  int N=A.size();
  auto B=A;
  sort(B.begin(),B.end());
  B.erase(unique(B.begin(),B.end()),B.end());
  map<i64,i64> mp;
  for(size_t i=0;i<B.size();++i){
    mp[B[i]]=i;
  }
  for(int i=0;i<N;++i){
    A[i]=mp[A[i]];
  }
  atcoder::fenwick_tree<i64> fwt(N);
  i64 ans=0;
  for(int i=0;i<N;++i){
    fwt.add(A[i],1);
    ans+=fwt.sum(A[i]+1,N);
  }
  return ans;
}
#endif

struct ESieve{
  int n;
  vector<i64> lpf;
  ESieve(int n_):n(n_),lpf(n_+1,-1){
    for(i64 p=2;p<=n;++p){
      if(lpf[p]!=-1){
        continue;
      }
      for(i64 q=p;q<=n;q+=p){
        if(lpf[q]==-1){
          lpf[q]=p;
        }
      }
    }
  }
  vector<pair<i64,i64>> operator()(int m){
    vector<i64> v;
    while(m!=1){
      v.emplace_back(lpf[m]);
      m/=lpf[m];
    }
    if(v.size()==0){
      return {};
    }
    vector<pair<i64,i64>> res;
    res.emplace_back(v[0],1);
    for(size_t i=1;i<v.size();++i){
      if(v[i-1]!=v[i]){
        res.emplace_back(v[i],1);
      }
      else{
        res.back().second++;
      }
    }
    return res;
  }
};

vector<int> Dist(vector<vector<int>> G,int v){
  int N=G.size();
  vector<int> dst(N,-1);
  queue<int> q;
  dst[v]=0;
  q.emplace(v);
  while(q.size()){
    int t=q.front();
    q.pop();
    for(auto u:G[t]){
      if(dst[u]==-1){
        dst[u]=dst[t]+1;
        q.emplace(u);
      }
    }
  }
  return dst;
}

void SpreadGrid(vector<string>& S,int h,int w,char c){
  int H=S.size(),W=S[0].size();
  auto res=MakeVec<string>(h,"");
  for(int i=0;i<h;++i){
    for(int j=0;j<w;++j){
      if(i<H && j<W){
        res[i]+=S[i][j];
      }
      else{
        res[i]+=c;
      }
    }
  }
  S=res;
}

bool CheckPrime(i64 n){
  if(n<2){
    return 0;
  }
  for(i64 i=2;i*i<=n;++i){
    if(n%i==0){
      return 0;
    }
  }
  return 1;
}

vector<pair<i64,i64>> PrimeFact(i64 n){
  vector<pair<i64,i64>> res;
  for(i64 i=2;i*i<=n;++i){
    if(n%i!=0){
      continue;
    }
    i64 ex=0;
    while(n%i==0){
      ex++,n/=i;
    }
    res.emplace_back(i,ex);
  }
  if(n!=1){
    res.emplace_back(n,1);
  }
  return res;
}

vector<i64> EnumDiv(i64 n){
  vector<i64> res;
  for(i64 i=1;i*i<=n;++i){
    if(n%i!=0){
      continue;
    }
    res.emplace_back(i);
    if(i*i!=n){
      res.emplace_back(n/i);
    }
  }
  sort(res.begin(),res.end());
  return res;
}

template<typename T> vector<pair<T,i64>> RunLenEnc(vector<T> a){
  int n=a.size();
  vector<pair<T,i64>> res;
  T now=a[0];
  int l=1;
  for(int i=1;i<n;++i){
    if(a[i-1]==a[i]){
      l++;
    }
    else{
      res.emplace_back(now,l);
      now=a[i],l=1;
    }
  }
  res.emplace_back(now,l);
  return res;
}

vector<pair<char,i64>> RunLenEnc(string a){
  int n=a.size();
  vector<pair<char,i64>> res;
  char now=a[0];
  int l=1;
  for(int i=1;i<n;++i){
    if(a[i-1]==a[i]){
      l++;
    }
    else{
      res.emplace_back(now,l);
      now=a[i],l=1;
    }
  }
  res.emplace_back(now,l);
  return res;
}

template<typename T> struct Comb{
  vector<T> fac,ifac;
  Comb(int mx=3000000):fac(mx+1,1),ifac(mx+1,1){
    for(int i=1;i<=mx;++i){
      fac[i]=fac[i-1]*i;
    }
    ifac[mx]/=fac[mx];
    for(int i=mx;i>0;--i){
      ifac[i-1]=ifac[i]*i;
    }
  }
  T operator()(int n,int k){
    if(n<0||k<0||n<k){
      return 0;
    }
    return fac[n]*ifac[k]*ifac[n-k];
  }
};

}

using namespace ttl;
Comb<ModInt<998244353>> Cb;

template<typename mint> mint dfs(int N,int K,vector<int> b,int s){
  if(s==N){
    i64 l=1;
    vector<int> cnt(N+1);
    mint prd=Cb.fac[N];
    for(auto v:b){
      prd*=Cb.fac[v-1]/Cb.fac[v];
      l=lcm(l,v);
      cnt[v]++;
    }
    for(auto v:cnt){
      prd/=Cb.fac[v];
    }
    return mint(l).pow(K)*prd;
  }
  int k=(b.size()==0?1:b.back());
  mint res=0;
  for(int t=k;t<=N-s;++t){
    auto c=b;
    c.emplace_back(t);
    res+=dfs<mint>(N,K,c,s+t);
  }
  return res;
}

int main(){
  constexpr u64 mod=998244353;
  using mint=ModInt<mod>;
  //[L,R] -> [0,R-L]
  //C <- max(A+B, C)
  //x (A) y (B) z
  //     (C)
  //sum[i=C,R-L] (i-A-B+1)*(R-L-i+1)
  //sum[i=0,R-L-C] (i-A-B+C+1)*(R-L-C-i+1)
  //sum[i=0,R-L-C] -(i+p)(i+q)
  i64 L,R,A,B,C;
  Scan(L,R,A,B,C);
  C=max(A+B,C);
  if(R-L<C){
    Print(0);
  }
  else{
    i64 p=-A-B+C+1,q=-(R-L-C+1);
    Print(-(mint(R-L-C+1)*p*q+mint(p+q)*(R-L-C)*(R-L-C+1)/2+mint(2*(R-L-C)+1)/3*(R-L-C)*(R-L-C+1)/2));
  }
}