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#include <fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int i,j,n,gr;
int mat[3][10005];
int w[5002];
int v[5002];
int main()
{
f>>n>>gr;
for(i=1;i<=n;i++)
{
f>>w[i]>>v[i];
}
for(i=1;i<=n;i++)
{
for(j=1;j<=gr;j++)
{
if(w[i]>j)
{
mat[i%2][j]=mat[(i-1)%2][j];
}
else
{
mat[i%2][j]=max(mat[(i-1)%2][j],mat[(i-1)%2][j-w[i]]+v[i]);
}
//g<<mat[i%2][j]<<" ";
}
//g<<"\n";
}
g<<mat[n%2][gr];
f.close();
g.close();
return 0;
}