#include <bits/stdc++.h>
#define MOD mod
#define int long long
using namespace std;
const int MAXN=5001;
const int mod=998244353;
int n,p,f[MAXN][MAXN*2],inv[MAXN*11],per,stop,a[MAXN];
signed main(){
    inv[1]=1;
    for(int i=2;i<MAXN*10;i++)inv[i]=(mod-mod/i)*inv[mod%i]%mod;
    cin>>n>>p;
    for(int i=1;i<=n;i++)cin>>a[i];
    per=(100-p)*inv[100]%mod;
    stop=p*inv[100]%mod;
    for(int i=1;i<=n;i++)cin>>a[i];
    f[0][n]=1;
    for(int i=1;i<=n;i++){
        for(int j=-i;j<=i;j++){
            f[i][j+n]=(f[i-1][j+n]*stop%mod+f[i-1][j-a[n-i+1]+n]*per%mod)%mod;
        }
        f[i][0+n]=1;
    }
    int ans=0;
    for(int i=-n;i<=n;i++){
        ans=(ans+f[n][i+n])%mod;
    }
    ans=(ans*inv[2*n+1])%mod;
    cout<<ans;
}