#include <fstream>
const int GMAX=1e4+5;

using namespace std;
ifstream cin("rucsac.in");
ofstream cout("rucsac.out");

int dp[GMAX];
int n,c,g,p,maxi;

int main()
{
    cin>>n>>c;
    int t,i;
    for(t=1;t<=c;t++) dp[t]=-1;
    for(t=1;t<=n;t++)
    {
        cin>>g>>p;
        for(i=c;i>=g;i--)
        {
            dp[i]=max(dp[i],dp[i-g]+p);
        }
    }
    for(i=1;i<=c;i++) maxi=max(maxi,dp[i]);
    cout<<maxi<<endl;
    return 0;
}