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#include <fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int n, w, m[5009],c[10009], V[2][10009],k, h;
int main()
{
f>>n>>w;
for(int i=1;i<=n;i++)
{f>>m[i]>>c[i];}
k=1; h=0;
for(int i=1;i<=n;i++)
{
if(i%2) {k=1; h=0;}
else {k=0;h=1;}
for(int j=1;j<=w;j++)
{
if(j<m[i]) V[k][j]=V[h][j];
else V[k][j]=max(V[h][j],V[h][j-m[i]]+c[i]);
}
}
g<<V[0][w];
return 0;
}