#include<bits/stdc++.h>
using namespace std;
using ll = long long;

const int N = 2e5 + 10;
int a[N], b[N];

int main(){
  ios::sync_with_stdio(0);
  cin.tie(0); cout.tie(0);

  int n;
  cin >> n;
  ll s1 = 0, s2 = 0;
  for(int i=0; i<n; ++i){
    cin >> a[i] >> b[i];
    s1 += a[i];
    s2 += b[i];
  }

  ll ans = 0;
  for(int i=0; i<n; ++i){
    s1 -= a[i];
    s2 -= b[i];
    ans += max(a[i] * s2, b[i] * s1);
  }

  cout << ans << '\n';

  return 0;
}