import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################

n = ni()
a, b = zip(*[na() for i in range(n)])

# sum_i a[i] * (i < j でx[j] = 2とした個数) or b[i]
inf = 10 ** 18
dp = [-inf] * (n + 1)
dp[0] = 0

for i in range(n-1, -1, -1):
    ndp = [-inf] * (n + 1)
    for j in range(n + 1):
        if j + 1 <= n:
            ndp[j+1] = max(ndp[j+1], dp[j] + b[i])
        ndp[j] = max(ndp[j], dp[j] + a[i] * j)
    
    dp = ndp
    # print(dp)

print(max(dp))