function Main(INPUT){
  const input=INPUT.split("\n");
  const [N,X,Q]=input[0].split(" ").map(_=>parseInt(_));
  let ans=0;
  for(let i=0;i<Q;i++){
    const t=i*2+1;
    const M=parseInt(input[t]);
    const s=new Set(input[t+1].split(" ").map(_=>parseInt(_)));
    if(s.has(X)){
      ans+=1;
    }
    else if(s.size!=M){
      ans+=0.5;
    }
  }
  console.log(ans);
}
Main(require("fs").readFileSync("/dev/stdin", "utf8"));