if let input1 = readLine(), let NK = input1.split(separator: " ").compactMap({Int($0)}) as? [Int],
   let N = NK.first, let K = NK.last
{
    var items: [[Int]] = []
    for _ in 0..<N {
        if let input2 = readLine(), let rows = input2.split(separator: " ").compactMap({Int($0)}) as? [Int] {
            items.append(rows)
        }
    }
    var dp: [[Int]] = Array(repeating: Array(repeating: 0, count: K+1), count: N+1)
    for n in 1...N {
        for k in 1...K {
            if items[n-1][0] <= k {
                dp[n][k] = max(dp[n-1][k], dp[n-1][k-items[n-1][0]] + items[n-1][1])
            }
            else {
                dp[n][k] = dp[n-1][k]
            }
        }
    }
    print(dp[N][K])
}