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