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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
long long d[3][10001];
int main()
{
int i,g;
pair<int,int>p[5001];
int n,G;
fin>>n>>G;
for(i=1;i<=n;i++)
fin>>p[i].first>>p[i].second;
for(i=1;i<=n;i++)
for(g=1;g<=G;g++)
if(p[i].first<=g)
{
d[1][g]=d[2][g];
d[2][g]=max(d[1][g],d[1][g-p[i].first]+p[i].second);
}
fout<<d[2][G];
return 0;
}