#include<iostream>
#include<cstdio>
using namespace std;
int n,d[10001],i,G,val,g,j,sol;
int main()
{
    freopen("rucsac.in","r",stdin);
    freopen("rucsac.out","w",stdout);
    cin>>n>>G;
    for(i=1;i<=G;i++) d[i]=-1;
    for(i=1;i<=n;i++)
    {
        cin>>val>>g;
        for(j=G;j>=0;j++)
            if(d[j]!=-1)
                if(d[j]+val>d[j+g]) d[j+g]=d[j]+val;
    }
    for(i=0;i<=G;i++) if(d[i]>sol) sol=d[i];
    cout<<sol;
    return 0;
}