#include<iostream>
using namespace std;
const int N=1010;
int f[N];
int v[N], w[N];
int n, m;
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)
        {
           if(j >= v[i]) f[j] = max(f[j], f[j - v[i]] + w[i]);
        }
    }
    cout << f[m] << endl;
    return 0;
}