#include <bits/stdc++.h>
using namespace std;
int main(){
int n;
cin >> n;
vector<long long> a;
for(int i=0;i<n;i++){
int h,k;
cin >> h >> k;
while(a.size()<h){
a.push_back(0);
}
for(int i=0;i<k;i++){
a[h-1-i]++;
}
}
while(true){
int z = 0;
for(int i=0;i<a.size()-1;i++){
if(a[i]<a[i+1]){
a[i]++;
a[i+1]--;
z = 1;
break;
}
}
if(z==0){
break;
}
}
long long ans = 0;
for(int i:a){
ans += i*(i-1)/2;
}
cout << ans << endl;
}
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