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#include <fstream>
#include <cstring>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
long long n,G,g[5003],v[5003],m[5003],sol=0;
int main()
{
fin>>n>>G;
for(int i=1;i<=n;i++)
fin>>g[i]>>v[i];
for(int i=1;i<=n;i++)
for(int j=G-g[i];j>=0;j--)
{
if(m[j+g[i]]<m[j]+v[i])
m[j+g[i]]=m[j]+v[i];
if(m[j+g[i]]>sol)
sol=m[j+g[i]];
}
fout<<sol;
return 0;
}