/* -*- coding: utf-8 -*-
 *
 * 3302.cc:  No.3302 Sense Battle - yukicoder
 */

#include<cstdio>
#include<algorithm>

using namespace std;

/* constant */

const int MAX_N = 5000;

/* typedef */

using ll = long long;

/* global variables */

int as[MAX_N], bs[MAX_N];
ll dp[MAX_N + 1][MAX_N + 1];

/* subroutines */

inline void setmax(ll &a, ll b) { if (a < b) a = b; }

/* main */

int main() {
  int n;
  scanf("%d", &n);
  for (int i = 0; i < n; i++) scanf("%d%d", as + i, bs + i);

  for (int i = n - 1; i >= 0; i--)
    for (int j = 0; i + j < n; j++) {
      setmax(dp[i][j], dp[i + 1][j] + (ll)as[i] * j);
      setmax(dp[i][j + 1], dp[i + 1][j] + bs[i]);
    }

  ll maxd = *max_element(dp[0], dp[0] + n + 1);
  printf("%lld\n", maxd);
  
  return 0;
}