#include<fstream>
#include <iostream>
using namespace std;

int N,G,a[10100];
int i,j,w,p;

void afiseaza(){
    int l;
    cout << "\n-----------\n";
    for(l=0;l<=G;l++) cout << a[l] << " ";
    cout << "\n-----------\n";
}
int main()
{
	ifstream f("rucsac.in");
	ofstream g("rucsac.out");
	f>>N>>G;//numarul de obiecte,greutatea maxima
	a[0]=1;
	for(i=0;i<N;i++)
	{
		f>>w>>p;//citeste greutatea si valoarea obiectului
		for(j=G-w;j>=0;j--)
		{
			if(a[j]+p>a[j+w])
				a[j+w]=a[j]+p;
		}
	}
	p=0;
	for(i=0;i<=G;i++)
	{
		if(a[i]>p)
			p=a[i];
	}
	g<<p-1;
	return 0;
}