#include <bits/stdc++.h>
using namespace std;
ifstream in("rucsac.in");
ofstream out("rucsac.out");
int n,g,i,j,k,gr[5001],pr[5001],d[10001],x;
int main()
{
    in>>n>>g;
    for(int i=1;i<=n;++i) in>>gr[i]>>pr[i];
    d[0]=1;
    for(i=1;i<=n;++i)
        for(j=g;j>=0;--j)
        if(j+gr[j]<g && d[j]!=0)
            d[j+gr[i]]=max(d[j+gr[i]],d[j]+pr[i]);
    for(int i=1;i<=g;++i) x=max(x,d[i]);
    out<<x-1;
}