Gleb And Pizza

#include<bits\stdc++.h>using namespace std;typedef long long ll;int main(){  double r,d,n,x,y,R,d1;while(cin>>r>>d>>n){    d=r-d;    int cnt=0;    for(int i=1;i<=n;i++){scanf("%lf%lf%lf",&x,&y,&R);d1=sqrt(x*x+y*y);if(d1+R<=r&&d1-R>=d)cnt++;}printf("%d\n",cnt);}    return 0;}