#ifdef DEBUG
#define _GLIBCXX_DEBUG
#define _GLIBCXX_DEBUG_PEDANTIC
#endif

#include <bits/stdc++.h>
#include <bits/extc++.h>
using namespace std;

#define min(args...) min({args})
#define max(args...) max({args})
#define redirect(filename) freopen(#filename".in", "r", stdin), freopen(#filename".out", "w", stdout)
#define all(container) container.begin(), container.end()
#define fastio ios::sync_with_stdio(false), cin.tie(0), cout.tie(0)
#define pb push_back
#define eb emplace_back
#ifdef DEBUG
#define debug() fprintf(stderr, "%d\n", __LINE__)
#define debugf(fmt, args...) fprintf(stderr, fmt, ## args)
#define debuglf(fmt, args...) fprintf(stderr, "%d: " fmt "\n", __LINE__, ## args)
#else
#define debug()
#define debugf(...)
#define debuglf(...)
#endif

template<typename t> class gpq : public priority_queue<t, vector<t>, greater<t>> {};
typedef int64_t ll;
typedef uint64_t ull;
typedef __int128 lll;
typedef long double ld;
typedef vector<int> vi;
typedef pair<int, int> pii;

const bool MULTIPLE_TESTS = 0;

const int mod=998244353,inv100=828542813;
int n,p,p2;
int a[5005];
int f[5005][10010];
inline void add(int& x,const ll& y){x=(x+y)%mod;}
int qpow(int x,int y){
    int ans=1;
    while(y){
        if(y&1)ans=(ll)ans*x%mod;
        x=(ll)x*x%mod,y>>=1;
    }
    return ans;
}
void solve(int _Tid) {
    static_assert(100ll*inv100%mod==1);
    cin>>n>>p;p=(ll)p*inv100%mod,p2=(mod+1-p)%mod;
    for(int i=1;i<=n;i++)cin>>a[i];
    f[n+1][n]=1;
    for(int i=n;i;i--){
        for(int j=-n;j<=n;j++)if(f[i+1][j+n]){
            add(f[i][j+n],(ll)f[i+1][j+n]*p);
            add(f[i][j+n+a[i]],(ll)f[i+1][j+n]*p2);
        }
        f[i][n]=1;
    }
    int ans=0;
    for(int i=-n;i<=n;i++)add(ans,f[1][n+i]);
    ans=(ll)ans*qpow(n*2+1,mod-2)%mod;
    cout<<ans<<'\n';
}

signed main() {
    #ifndef DEBUG
    fastio;
    #endif
    #ifdef DEBUG
    auto _Tbe = chrono::steady_clock::now();
    #endif
    int T = 1;
    if (MULTIPLE_TESTS) cin >> T;
    for (int _ = 1; _ <= T; _++) solve(_);
    #ifdef DEBUG
    auto _Ted = chrono::steady_clock::now();
    debugf("Used time: %lldms\n", chrono::duration_cast<chrono::milliseconds>(_Ted - _Tbe).count());
    #endif
    return 0;
}