#include<bits/stdc++.h>
#define st first
#define nd second

using  namespace std;
using pii = pair<int, int>;
using ll = long long;
const  int N = 3e3 + 10;
const int mod = 998244353;
int dp[N];
int add(int a, int b){
    a += b;
    a %= mod;
    return a;
}
int main(){
    int n, k, x, ans = 0;
    scanf("%d %d",&n, &k);
    dp[0] = 1;
    for(int i =1; i <= n; i++){
        scanf("%d", &x);
        if(x <= k){
            for(int j = k; j >= x; j--){
                dp[j] = add(dp[j], dp[j - x]);
            }
        }
        dp[0]++;
        ans = add(ans, dp[k]);
    }
    printf("%d", ans);
}