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#include<iostream>
#include<fstream>
using namespace std;
int main ()
{
ifstream f("rucsac.in");
ofstream gg("rucsac.out");
int N,G,i,g,v,max,j;
f>>N>>G;
int d[G+1];
d[0]=0;
for(i=1;i<=G;i++)
d[i]=-1;
for(i=1;i<=N;i++)
{
f>>g>>v;
for(j=G;j>=0;j--)
{
if(d[j]!=-1&&j+g<=G&&d[j]+v>d[j+g])
d[j+g]=d[j]+v;
}
}
max=0;
for(i=1;i<=G;i++)
if(d[i]>max)
max=d[i];
gg<<max;
return 0;
}