#include <bits/stdc++.h>
using namespace std; 
typedef long long i64; 
const int P = 998244353; 

int c, n, T; 
int a[205], t[205], p[205]; 
int f[300005], g[300005]; 
i64 pr[205]; 

int main(void) {
    ios::sync_with_stdio(0); 
    cin >> n >> T; 
    for (int i = 1; i <= n; ++i) cin >> a[i]; 
    for (int i = 1; i <= n; ++i) cin >> t[i]; 
    for (int i = p[0] = 1; i <= n; ++i) p[i] = 2 * p[i - 1] % P; 

    int ans = 0; 
    f[0] = 1; 
    for (int i = 1; i <= n; ++i) {
        int sum = 0; 
        for (int j = 0; j <= T - t[i]; ++j) sum = (sum + f[j]) % P; 
        ans = (ans + 1ll * a[i] * sum % P * p[n - i]) % P; 
        // cout << i << " " << sum << " IOI\n"; 
        for (int j = T; j >= t[i]; --j)
            f[j] = (f[j] + f[j - t[i]]) % P; 
    }
    // 作为 IOI 赛制时的得分，前 i 个选背包

    // 作为 OI 赛制时的得分，后 i 个选背包
    for (int i = 1; i <= n; ++i) pr[i] = pr[i - 1] + t[i]; 
    g[0] = 1; 
    for (int i = n; i >= 1; --i) {
        if (pr[i - 1] + t[i] <= T) {
            int sum = 0; 
            for (int j = 0; j <= T - pr[i]; ++j) sum = (sum + g[j]) % P; 
            // cout << i << " " << sum << " OI\n"; 
            ans = (ans + 1ll * a[i] * sum % P * p[i - 1]) % P; 
        }
        for (int j = T; j >= t[i]; --j) g[j] = (g[j] + g[j - t[i]]) % P; 
    }
    cout << ans << '\n'; 
    return 0; 
}