#include <iostream>
#include <cstring>
#include <algorithm>
using namespace std;
const int N = 1010;
int v[N],w[N],f[N];
int main()
{
    int n,m;
    cin >> n >> m;
    for(int i=1;i<=n;i++)cin >> v[i]>>w[i];



    for(int i=1;i<=n;i++)
        for(int j=v[i];j<=m;j++)
            f[j]=max(f[j],f[j-v[i]]+w[i]);

    cout << f[m];
    return 0;
}