#include<fstream>
using namespace std;
#define Gmax 10000
#define Nmax 5000
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int A[Gmax],p,u,i,j,G[Nmax],P[Nmax],n,ga,sol;
int main()
{
	f>>n>>ga;
    for(i=1;i<=n;++i)
		f>>G[i]>>P[i];
    for(i=1;i<=n;++i)
        for(j=ga;j>=0;--j)
            if(j+G[i]<=ga && A[j+G[i]]<A[j]+P[i])
                A[j+G[i]]=A[j]+P[i] ;
    sol = 0 ;
    for(i=1;i<=ga;++i)
        if(A[i]>sol) 
			sol=A[i] ;
    g<<sol;
}