#include <fstream>
using namespace std;
ifstream cin("rucsac.in");
ofstream cout("rucsac.out");
int n,g,i,j;
int greutate[5001],profit[5001],dp[5001];
int main()
{
    cin>>n>>g;
    for(i=1; i<=n; i++)
        cin>>greutate[i]>>profit[i];
    for(i=1; i<=n; i++)
    {
        for(j=g-greutate[i]; j>=0; j--)
        {
            if(dp[j+greutate[i]] < dp[j]+profit[i])
                dp[j+greutate[i]]= dp[j]+profit[i];
        }
    }
    cout<<dp[g];

}