#include <bits/stdc++.h>

using namespace std;
ifstream in("rucsac.in");
ofstream out("rucsac.out");
const int nx = 5001;
const int gx = 10001;
int v[nx],g[nx],gmax;
int s[gx];
int n;
int mx;
int main()
{
    in>>n>>gmax;
    for(int i=1; i<=n; i++)
        in>>g[i]>>v[i];
    for(int i=1; i<=n; i++)
        for(int j = gmax - g[i]; j>=0; j--)
            if(s[j+g[i]]<s[j]+v[i])
            {
                s[j+g[i]]=s[j]+v[i];
                mx = max(s[j+g[i]],mx);
            }
    out<<mx;
    return 0;
}