#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000001

mint get(long long N){
	if(N+3<0)return 0;
	mint ret = 1;
	rep(i,3){
		ret *= N+3-i;
		ret /= i+1;
	}
	return ret;
}

int main() {
    
	long long L,R,A,B,C;
	cin>>L>>R>>A>>B>>C;
	
	long long N = R-L-A-B;
	if(N<0){
		cout<<0<<endl;
		return 0;
	}
	
	long long K = C-A-B;
	if(K<0)K = 0;
	//cout<<N<<','<<K<<endl;
	mint ans = 0;
	ans += get(N-K) * (K+1);
	ans -= get(N-(K+1)) * K;
	
	cout<<ans.val()<<endl;
	
    return 0;
}