#include<bits/stdc++.h>
using namespace std;
#define int long long
#define ff first
#define ss second
#define pb push_back
const int N=4e5+5;
vector<int>v[N];
signed main(){
int n;
cin>>n;
map<int,int>mpx,mpy,idx,idy;
vector<pair<int,int>>vc;
for(int i=1;i<=n;i++){
int x,y;
cin>>x>>y;
vc.pb({x,y});
idx[x];
idy[y];
}
int e=1,d=1;
for(auto it=idx.begin();it!=idx.end();it++){
it->ss =e++;
}
for(auto it=idy.begin();it!=idy.end();it++){
it->ss =d++;
}
for(auto p:vc){
int x= idx[p.ff];
int y=idy[p.ss];
mpx[x]++;
mpy[y]++;
v[x].pb(y);
}
int cnt=0;
for(auto it=mpx.begin();it!=mpx.end();it++){
int x= it->ff;
for(auto y:v[x]){
cnt+= (mpy[y]-1)*(mpx[x]-1);
}
}
cout<<cnt;
}
