#include<vector>
#include<stdio.h>
using namespace std;
int n,rez, g,l;
vector<int> p,w;
vector<vector<int> > r;

void citire()
{
    scanf("%d%d",&n,&g);
    p.resize(n+1);
    w.resize(n+1);
    for(int i=1;i<=n;i++)
    scanf("%i%i",&w[i],&p[i]);
}

void pd()
{
    r.resize(n+1,vector<int> (3));
    for(int i=1;i<=n;i++,l=1-l)
    for(int j=0;j<=g;j++)
    {
        r[1-l][j]=r[l][j];
        if(w[i]<=j)
        r[1-l][j]=max(r[1-l][j],r[l][j-w[i]]+p[i]);
    }
    rez=r[n][l];
    printf("%d\n", rez);
}

int main()
{
    freopen("rucsac.in","r",stdin);
    freopen("rucsac.out","w",stdout);
    citire();
    pd();
}