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#include <fstream>
#include<cmath>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int D[5001][5001];
int n,g;
int G[5001],P[5001];
int rucsac(int i,int j)
{
if(i==0) return 0;
if(D[i][j]!=0) return D[i][j];
if(j<G[i]) return D[i-1][j]=rucsac(i-1,j);
return D[i][j]=max(rucsac(i-1,j),rucsac(i-1,j-G[i])+P[i]);
}
int main()
{
int i;
fin>>n>>g;
for(i=1;i<=n;i++)
fin>>G[i]>>P[i];
fout<<rucsac(n,g);
return 0;
}