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#include <fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int d[3][100001],gg,w[5010],p[5010],n;
void sc()
{
int i;
for (i=0;i<=gg;i++)
{
d[1][i]=d[2][i];
}
}
int main()
{
int i,j;
f>>n>>gg;
for (i=1;i<=n;i++)
{
f>>w[i]>>p[i];
}
for (i=1;i<=n;i++)
{
for (j=0;j<=gg;j++)
{
if (w[i]<=j)
{
d[2][j]=max(d[1][j],d[1][j-w[i]]+p[i]);
}
else
{
d[2][j]=d[1][j];
}
}
sc();
}
g<<d[1][gg];
return 0;
}