#include <fstream>

using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int n,G,i,j,ma,gr[5001],b[5001],p[5001];
int main()
{
    f>>n>>G;
    for(i=1;i<=n;++i)
    {
        f>>gr[i]>>p[i];
    }
    b[gr[1]]=p[1];
    for(i=2;i<=n;++i)
    {
        for(j=G-gr[i];j>=1;--j)
            if(b[j]>0)
            if(b[j+gr[i]]<b[j]+p[i])
            b[j+gr[i]]=b[j]+p[i];
        if(b[gr[i]]<p[i])
            b[gr[i]]=p[i];
    }
    ma=0;
    for(i=G;i>=1;--i)
        if(b[i]>ma)
        ma=b[i];
    g<<ma;
    return 0;
}