n = int(input())
AB = [tuple(map(int, input().split())) for _ in range(n)]
inf = float("INF")
dp = [-inf] * (n+1)
dp[0] = 0
for a, b in AB[::-1]:
    for i in range(n-1, -1, -1):
        dp[i+1] = max(dp[i+1], dp[i] + b)
        dp[i] = max(dp[i], dp[i] + a * i)

print(max(dp))