#include <fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
short w[1000],v[1000],m[10001][10001],n,W,i,j;
int main()
{
    f>>n>>W;
    for(i=1;i<=n;i++)
        f>>w[i]>>v[i];
    for (i=1;i<=n;i++)
     for(j=0;j<=W;j++)
         if (w[i]>j)
             m[i][j]=m[i-1][j];
         else
            m[i][j]= max(m[i-1][j],m[i-1][j-w[i]]+v[i]);
            g<<m[n][W];
    return 0;
}