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#include<fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int i,j,n,_g,v[10001],w[5001],k,p[5001];
int main()
{
f>>n>>_g;
for(i=1;i<=n;i++)
f>>w[i]>>p[i];
v[0]=0;
for(i=1;i<=n;i++)
for(j=_g-w[i];j>=0;j--)
if(v[j+w[i]]<v[j]+p[i])
{
v[j+w[i]]=v[j]+p[i];
if(v[j+w[i]]>k)
k=v[j+w[i]];
}
g<<k;
f.close();
g.close();
return 0;
}