#include <stdio.h>
#include <stdlib.h>
int w[5001],p[5001],a[10001];
int main()
{
    FILE *fin,*fout;
    int n,g,i,j,sol;
    fin=fopen("rucsac.in","r");
    fout=fopen("rucsac.out","w");
    fscanf(fin,"%d%d",&n,&g);
    for(i=1;i<=n;i++)
        fscanf(fin,"%d%d",&w[i],&p[i]);
    sol=0;
    for(i=1;i<=n;i++)
        for(j=g-w[i];j>=0;j--)
            if(a[j+w[i]]<a[j]+p[i])
            {
                a[j+w[i]]=a[j]+p[i];
                if(a[j+w[i]]>sol)
                    sol=a[j+w[i]];
            }
    fprintf(fout,"%d\n",sol);
    fclose(fin);
    fclose(fout);
    return 0;
}