#include <bits/stdc++.h>
using namespace std;

#define int long long

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

int n,W,g[5005],v[5005],dp[5005];

signed main()
{
    fin>>n>>W;
    for(int i=1;i<=n;i++)
    {
        fin>>g[i]>>v[i];
    }
    for (int i = 1; i <= n; i++) {
        for (int w = W; w >= g[i]; w--) {
            dp[w] = max(dp[w], dp[w - g[i]] + v[i]);
        }
    }
    fout<<dp[W];
    return 0;
}