#pragma GCC optimize("Ofast") #pragma GCC target("avx2") char*mmap(); #define RD(v) int v=0;{int _c;while(_c=*rp++-48,_c>=0)v=v*10+_c;} #define WTHI(v) {long _z=v,_n=0,_d=0;while(++_n,_d=_d<<8|0x30|_z%10,_z/=10);*(long*)wp=_d;wp+=_n;} #define WTLO(v) {long _z=v,_n=8,_d=0;while(_d=_d<<8|0x30|_z%10,_z/=10,--_n);*(long*)wp=_d;wp+=8;} #define WT(v) if(v>=100000000){WTHI(v/100000000);WTLO(v);}else{WTHI(v);} long dp[42][1024]; main(){ char*rp=mmap(0l,1l<<28,1,2,0,0ll); RD(n); RD(k); RD(x); RD(y); int b=0; while(k--){ RD(j); dp[0][j]=1; } for(int i=1;i1023){ y=1023; } for(int j=x;j<=y;++j){ z+=dp[n-1][j]; } z%=998244353; char wbuf[16],*wp=wbuf; WT(z); write(1,wbuf,wp-wbuf); _exit(0); }