#include using namespace std; typedef signed long long ll; #define _P(...) (void)printf(__VA_ARGS__) #define FOR(x,to) for(x=0;x<(to);x++) #define FORR(x,arr) for(auto& x:arr) #define FORR2(x,y,arr) for(auto& [x,y]:arr) #define ALL(a) (a.begin()),(a.end()) #define ZERO(a) memset(a,0,sizeof(a)) #define MINUS(a) memset(a,0xff,sizeof(a)) template bool chmax(T &a, const T &b) { if(a bool chmin(T &a, const T &b) { if(a>b){a=b;return 1;}return 0;} //------------------------------------------------------- const ll mo=998244353; int N,A,B; vector F[19],G[19]; ll modpow(ll a, ll n = mo-2) { ll r=1; a%=mo; while(n) r=r*((n%2)?a:1)%mo,a=a*a%mo,n>>=1; return r; } ll comb(ll N_, ll C_) { const int NUM_=1400001; static ll fact[NUM_+1],factr[NUM_+1],inv[NUM_+1]; if (fact[0]==0) { inv[1]=fact[0]=factr[0]=1; for (int i=2;i<=NUM_;++i) inv[i] = inv[mo % i] * (mo - mo / i) % mo; for (int i=1;i<=NUM_;++i) fact[i]=fact[i-1]*i%mo, factr[i]=factr[i-1]*inv[i]%mo; } if(C_<0 || C_>N_) return 0; return factr[C_]*fact[N_]%mo*factr[N_-C_]%mo; } template vector fft(vector v, bool rev=false) { int n=v.size(),i,j,m; for(i=0,j=1;j>1;k>(i^=k);k>>=1); if(i>j) swap(v[i],v[j]); } for(int m=2; m<=n; m*=2) { T wn=modpow(5,(mo-1)/m); if(rev) wn=modpow(wn); for(i=0;i=mo) v[j1]-=mo; while(v[j2]>=mo) v[j2]-=mo; w=(ll)w*wn%mo; } } } if(rev) { ll rv = modpow(n); FOR(i,n) v[i]=(ll)v[i]*rv%mo; } return v; } template vector MultPoly(vector P,vector Q,bool resize=false) { if(resize) { int maxind=0,pi=0,qi=0,i; int s=2; FOR(i,P.size()) if(norm(P[i])) pi=i; FOR(i,Q.size()) if(norm(Q[i])) qi=i; maxind=pi+qi+1; while(s*2 R(s*2); for(int x=0;x<2*s;x++) for(int y=0;x+y<2*s;y++) (R[x+y]+=P[x]*Q[y])%=mo; return R; } } P=fft(P), Q=fft(Q); for(int i=0;i>N>>A>>B; A=A*modpow(B)%mo; F[0]={0,1}; FOR(i,N) { vector S=F[i],T; FOR(j,S.size()) { (S[j]*=comb(1< X=MultPoly(S,S,1); vector Y=MultPoly(S,T,1); FOR(j,(1<<(i+1))+1) { ll a=((2*mo+1-2*A)*X[j]+2*A*Y[j])%mo; a=a*modpow(comb(1<<(i+1),j))%mo; F[i+1].push_back(a); } } G[0]={1}; FOR(i,N) { vector S=G[i],T=F[i],U; FOR(j,S.size()) { (S[j]*=comb((1< X=MultPoly(S,T,1); vector Y=MultPoly(S,U,1); FOR(j,(1<<(i+1))) { ll a=((2*mo+1-2*A)*X[j]+A*Y[j])%mo; a=a*modpow(comb((1<<(i+1))-1,j))%mo; G[i+1].push_back(a); } } FOR(i,1<