#include <fstream>
#define INF 50000000

using namespace std;

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

long long b[10001];

int main()
{
    int n,i,j;
    int maxi=0;
    int G,g,p;
    cin>>n>>G;
    for(i=1;i<=G;i++)
    {
        b[i]=-INF;
    }
    for(j=1;j<=n;j++)
    {
        cin>>g;
        cin>>p;
        for(i=min(G-g,maxi);i>=0;i--)
        {
            if(b[i+g]<b[i]+p)
                b[i+g]=b[i]+p;
            if(i+g>maxi)
                maxi=i+g;
        }
    }
    i=maxi;
    maxi=0;
    for(;i>=0;i--)
    {
        if(b[i]>maxi)
            maxi=b[i];
    }
    cout<<maxi;
    return 0;
}