#include<iostream>

using namespace std;

const int N = 1010;
int n,m;
int v[N],w[N];
int f[N];

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;
}