哪里错了啊

求大佬

#include<bits/stdc++.h>
using namespace std;
int main()
{
	int num,across[5001],vertical[5001],aLen[5001],vLen[5001],x,y,ans;
	cin>>num;
	for(int i=0;i<num;i++) cin>>across[i]>>vertical[i]>>aLen[i]>>vLen[i];
	cin>>x>>y;
	for(int i=0;i<num;i++) if(x>=across[i]&&x<across[i]+aLen[i]&&y>=vertical[i]&&y<vertical[i]+vLen[i]) ans++;
    cout<<ans;
	return 0;
}

为啥才20分？