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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream afis("rucsac.out");
int n,g,i,w[5001],p[5001],m[10001],j,ma;
int main()
{
f>>n>>g;
for (i=1;i<=n;i++)
{
f>>w[i]>>p[i];
}
m[w[1]]=p[1];
for (i=2;i<=n;i++)
{
for (j=g;j>=0;j--)
{
if (j-w[i]<0) break;
else
{
if (m[j-w[i]]!=0) m[j]=max(m[j],m[j-w[i]]+p[i]);
}
m[w[i]]=max(m[w[i]],p[i]);
}
}
ma=0;
for (i=0;i<=g;i++)
ma=max(ma,m[i]);
afis<<ma;
return 0;
}