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