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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int i,j,n,m,G,w[5002],p[5002],v[10002];
int main()
{
fin>>n>>G;
for(i=1;i<=n;i++)
fin>>w[i]>>p[i];
for(j=w[1];j<=G;j++)
v[j]=p[1];
for(i=2;i<=n;i++)
for(j=G;j>=1;j--)
if(v[j]<p[i]+v[j-w[i]]&&j-w[i]>=0)
v[j]=p[i]+v[j-w[i]];
fout<<v[G];
return 0;
}