#include<cstdio>
#include<algorithm>
#include<cstring>
using namespace std;
FILE *f=fopen("rucsac.in","r");
FILE *g=fopen("rucsac.out","w");
int n, gmax, v[5001], gre[5001],i, j, l, v1[10001], v2[10001], pmax;
int main()
{
    fscanf(f,"%d %d",&n,&gmax);
    for(i=1;i<=n;i++)fscanf(f,"%d %d",&v[i],&gre[i]);
    for(i=1;i<=n;i++)
    {
        for(j=1;j<=gmax;j++)
        {
            v1[j]=v2[j];
            if(j>=v[i])
            {
                v1[j]=max(v2[j],gre[i]+v2[j-v[i]]);
            }
        }
        for(j=1;j<=gmax;j++)v2[j]=v1[j];
        pmax=v1[gmax];
    }
    fprintf(g,"%d",pmax);
    fclose(f);
    fclose(g);
    return 0;
}