#include<bits/stdc++.h>
#define ll long long
using namespace std;
long long read(){
	long long x=0,f=1;char ch=getchar();
	while(!isdigit(ch))
	{if(ch=='-') f=-1;ch=getchar();}
	while(isdigit(ch)){x=x*10+ch-48;ch=getchar();}
	return x*f;
}
void write(long long x){
    if(x<0) putchar('-'),x=-x;
    if(x>9) write(x/10);
    putchar(x%10+'0');
}
const int N=1e5+10;
int n;
struct Node{
	int x1,y1,x2,y2;
}a[N];
int b[N][4];
bitset<N>s[N],zy[N];
int id[N],di[N],k;
bool cmp1(int p,int q){
	return b[p][k]<b[q][k];
}
bool cmp2(int p,int q){
	return b[p][k]<b[q][k];
}
void solve(int n){
	for(int i=1;i<=n;i++)id[i]=di[i]=i;
	for(int i=1;i<=n;i++)s[i].set();
	k=0;sort(id+1,id+n+1,cmp1);
	k=2;sort(di+1,di+n+1,cmp1);
	for(int i=1;i<=n;i++)zy[i]=zy[i-1],zy[i].set(id[i]);
	for(int i=1,j=0;i<=n;i++){
		while(j+1<=n&&b[id[j+1]][0]<b[di[i]][2])j++;
		s[di[i]]&=zy[j];
	}
	k=2;sort(id+1,id+n+1,cmp2);
	k=0;sort(di+1,di+n+1,cmp2);
	for(int i=1;i<=n;i++)zy[i]=zy[i-1],zy[i].set(id[i]);
	for(int i=1,j=0;i<=n;i++){
		while(j+1<=n&&b[id[j+1]][2]>b[di[i]][0])j++;
		s[di[i]]&=zy[j];
	}
	k=1;sort(id+1,id+n+1,cmp1);
	k=3;sort(di+1,di+n+1,cmp1);
	for(int i=1;i<=n;i++)zy[i]=zy[i-1],zy[i].set(id[i]);
	for(int i=1,j=0;i<=n;i++){
		while(j+1<=n&&b[id[j+1]][1]<b[di[i]][3])j++;
		s[di[i]]&=zy[j];
	}
	k=3;sort(id+1,id+n+1,cmp2);
	k=1;sort(di+1,di+n+1,cmp2);
	for(int i=1;i<=n;i++)zy[i]=zy[i-1],zy[i].set(id[i]);
	for(int i=1,j=0;i<=n;i++){
		while(j+1<=n&&b[id[j+1]][3]>b[di[i]][1])j++;
		s[di[i]]&=zy[j];
	}
}
int main(){
	//freopen(".in","r",stdin);
	//freopen(".out","w",stdout);
	n=read();
	for(int i=1;i<=n;i++){
		b[i][0]=a[i].x1=read();
		b[i][1]=a[i].y1=read();
		b[i][2]=a[i].x2=read();
		b[i][3]=a[i].y2=read();
	}
	solve(n);
	for(int i=1;i<=n;i++){
		if(s[i].count()!=2){
			for(int j=0;j<4;j++)swap(b[i][j],b[n][j]);
			n--;i--;
		}
	}
	solve(n);
	int ans=0;
	for(int i=1;i<=n;i++){
		if(s[i].count()==2)ans++;
	}
	write(ans/2);puts("");
	return 0;
}

/tmp/ccjurSTY.o: in function `cmp1(int, int)':
answer.code:(.text+0x14): relocation truncated to fit: R_X86_64_PC32 against symbol `b' defined in .bss section in /tmp/ccjurSTY.o
/tmp/ccjurSTY.o: in function `cmp2(int, int)':
answer.code:(.text+0x44): relocation truncated to fit: R_X86_64_PC32 against symbol `b' defined in .bss section in /tmp/ccjurSTY.o
/tmp/ccjurSTY.o: in function `solve(int)':
answer.code:(.text+0x3da): relocation truncated to fit: R_X86_64_PC32 against symbol `b' defined in .bss section in /tmp/ccjurSTY.o
answer.code:(.text+0x50b): relocation truncated to fit: R_X86_64_PC32 against symbol `b' defined in .bss section in /tmp/ccjurSTY.o
answer.code:(.text+0x632): relocation truncated to fit: R_X86_64_PC32 against symbol `b' defined in .bss section in /tmp/ccjurSTY.o
answer.code:(.text+0x758): relocation truncated to fit: R_X86_64_PC32 against symbol `b' defined in .bss section in /tmp/ccjurSTY.o
/tmp/ccjurSTY.o: in function `main':
answer.code:(.text.startup+0x19): relocation truncated to fit: R_X86_64_PC32 against symbol `n' defined in .bss section in /tmp/ccjurSTY.o
answer.code:(.text.startup+0x28): relocation truncated to fit: R_X86_64_PC32 against symbol `a' defined in .bss section in /tmp/ccjurSTY.o
answer.code:(.text.startup+0x2f): relocation truncated to fit: R_X86_64_PC32 against symbol `b' defined in .bss section in /tmp/ccjurSTY.o
answer.code:(.text.startup+0x6d): relocation truncated to fit: R_X86_64_PC32 against symbol `n' defined in .bss section in /tmp/ccjurSTY.o
answer.code:(.text.startup+0x84): additional relocation overflows omitted from the output
collect2: error: ld returned 1 exit status