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

int n,m;
int f[1010],v[1010],w[1010];

int main()
{
    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]<<endl;
    return 0;
}