#include <fstream>
using namespace std;

ifstream f("rucsac.in");
ofstream g("rucsac.out");

int n,gmax,v[5002],gr[5002],sol[5002];

int main()
{
    f>>n>>gmax;
    for(int i=1;i<=n;++i)f>>gr[i]>>v[i];
    for(int i=1;i<=n;++i)
        for(int j=gmax;j>=gr[i];--j)
            sol[j]=max(sol[j],sol[j-gr[i]]+v[i]);
    g<<sol[gmax];
    return 0;
}