#include <iostream>
#include<cstdio>
using namespace std;
int N,G,v[10001],g,p,i,j;

int main()
{
freopen("rucsac.in","r",stdin);
freopen("rucsac.out","w",stdout);
    scanf("%d%d",&N,&G);

    for(i=1;i<=G;i++)
        v[i]=-1;
    v[0]=0;
    for(i=1;i<=N;i++)
    {
        scanf("%d%d",&g,&p);
        for(j=G-g;j>=0;j--)
        {
            if(v[j]!=-1)
            {
                if(v[j+g]<v[j]+p)
                     v[j+g]=v[j]+p;
            }
        }
    }
   int Max=0;
   for(i=1;i<=G;i++)
        if(Max<v[i])
          Max=v[i];
   printf("%d",Max);
    return 0;
}