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#include<fstream>
using namespace std;
#define max(a,b) ((a>b)?a:b)
ifstream f("rucsac.in");
ofstream h("rucsac.out");
int n,g,i,w[5010],p[5010],d[2][10010],c,l;
int main()
{
f>>n>>g;
for(i=1;i<=n;i++)
f>>w[i]>>p[i];
l=0;
for(i=1;i<=n;i++,l=1-l)
for(c=0;c<=g;c++)
{
d[1-l][c]=d[l][c];
if(w[i]<=c)
d[1-l][c]=max(d[1-l][c],d[l][c-w[i]]+p[i]);
}
h<<d[l][g];
}