#include<bits/stdc++.h>
using namespace std;
#define int long long
#define pii pair<int,int>
#define ff first
#define ss second
#define pb push_back
#define vi vector<int>
#define fr(i,ii,iii) for(int i=ii;i<iii;i++)
const int N=3e5+5;
int n;
pii p[N];
map<int,int>mp;
map<pii,int>f;
int x[N],y[N];
signed main(){
ios_base::sync_with_stdio(NULL);cin.tie(NULL);
cin>>n;
fr(i,1,n+1){
cin>>p[i].ff>>p[i].ss;
}
sort(p+1,p+n+1);
int z=1;
fr(i,1,n+1){
if(mp.count(p[i].ff)==0){
mp[p[i].ff]=z;
z++;
}
}
fr(i,1,n+1){
p[i].ff=mp[p[i].ff];
swap(p[i].ff,p[i].ss);
}
sort(p+1,p+n+1);
z=1;
fr(i,1,n+1){
if(mp.count(p[i].ff)==0){
mp[p[i].ff]=z;
z++;
}
}
fr(i,1,n+1){
p[i].ff=mp[p[i].ff];
swap(p[i].ff,p[i].ss);
}
fr(i,1,n+1){
x[p[i].ff]++;
y[p[i].ss]++;
f[p[i]]++;
}
int ans=0;
fr(i,1,n+1){
ans+=(x[p[i].ff]-f[p[i]])*(y[p[i].ss]-f[p[i]]);
}
cout<<ans;
}
