#include <cstdio>
#include <fstream>
#include <algorithm>

using namespace std;

int g[5001],p[5001],d[2][10001],n,i,j,G,k;

int main ()
{
	
	ifstream f ("rucsac.in");
	freopen ("rucsac.out","w",stdout);
	f>>n>>G;
	for(i=1;i<=n;++i)
		f>>g[i]>>p[i];
	for(i=1;i<=n;++i,j=1-j)
		for(k=0;k<=G;++k){
			d[1-j][k]=d[j][k];
			if(g[i]<=k)
				d[1-j][k]=max(d[1-j][k],d[j][k-g[i]]+p[i]);
			}
	printf("%d",d[j][G]);
	
	return 0;}