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#include <iostream>
#include <vector>
#include <fstream>
using namespace std;
typedef pair<int,int> targy;
int main()
{
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n,g;
fin>>n>>g;
vector<targy>targyak;
int a,b;
for(int i=1;i<=n;i++)
{
fin>>a>>b;
targyak.push_back(make_pair(a,b));///Tomeg-Ar
}
int elozoSor[g+1]={};
int maxProfit[g+1]={};
for(int i=0;i<n;i++)
{
for(int j=1;j<=g;j++)
elozoSor[j]=maxProfit[j];///Lemasoljuk az elozo sort
if(targyak[i].first<=g&&targyak[i].second>elozoSor[targyak[i].first])///Ha csak az aktualis targyat vesszuk
{
maxProfit[targyak[i].first]=targyak[i].second;
}
for(int j=1;j<g;j++)
{
if(elozoSor[j])
{
if(targyak[i].first+j<=g&&elozoSor[targyak[i].first+j]<elozoSor[j]+targyak[i].second)
{
maxProfit[targyak[i].first+j]=elozoSor[j]+targyak[i].second;
}
}
}
}
int maxi=0;
for(int i=1;i<=g;i++)
{
if(maxi<maxProfit[i])
maxi=maxProfit[i];
}
fout<<maxi;
return 0;
}