#include <bits/stdc++.h>
using namespace std;
const int NMAX = 5002;
const int GMAX = 10002;
int n,g,w,p,dp[GMAX];

ifstream fin("rucsac.in");
ofstream fout("rucsac.out");

int main()
{
    fin >> n >> g;
    memset(dp, -1, sizeof(dp));
    dp[0] = 0;
    for(int i = 1; i <= n; i++){
        fin >> w >> p;
        for(int adaos = g-w; adaos >= 0; adaos--){
            if(dp[adaos] != -1){
                dp[w+adaos] = max(dp[w+adaos], dp[adaos]+p);
            }
        }
    }
    int ans = 0;
    for(int i = 1; i <= g; i++){
        ans = max(ans, dp[i]);
    }
    fout << ans;
    return 0;
}