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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int a[10001],s,w[5001],p[5001];
int N,G,i,j;
int main(){
fin >> N >> G;
s=0;
for(i=0;i<=G;i++)
{
a[i]=0;
}
for(i=1;i<=N;i++)
{
fin >> w[i] >> p[i];
}
for(i=1;i<=N;i++)
{
for(j=G-w[i];j>=0;j--)
{
if(a[j+w[i]]<a[j]+p[i])
{
a[j+w[i]]=a[j]+p[i];
if(a[j+w[i]]>s)
{
s=a[j+w[i]];
}
}
}
}
fout << s;
return 0;
}