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#include <bits/stdc++.h>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
struct rucsac
{
int w,p;
}v[5010];
int n,G,i,greut,d[2][10100];
int main()
{
f>>n>>G;
for(i=1;i<=n;i++)
{
f>>v[i].w>>v[i].p;
}
for(i=1;i<=n;i++)
{
for(greut=0;greut<=G;greut++)
{
if(greut>=v[i].w)
{
d[2][greut]=max((d[1][greut-v[i].w]+v[i].p),d[1][greut]);
}
else
{
d[2][greut]=d[1][greut];
}
}
for(greut=0;greut<=G;greut++)d[1][greut]=d[2][greut];
}
g<<d[1][G];
return 0;
}