#include <fstream>

using namespace std;
ifstream in("rucsac.in");
ofstream out("rucsac.out");
const int MAX=5005;
int g,n,p[MAX],w[MAX],profit[MAX];

int main()
{
    in>>n>>g;
    for(int i=1;i<=n;i++)
        in>>p[i]>>w[i];
    for(int j=1;j<=g;j++)
        profit[j]=-1;
    profit[0]=0;
    for(int i=0;i<n;i++){
        for(int j=g-w[i];j>=0;j--){
            if(profit[j]!=-1){
                if(p[i]+profit[j]>profit[j+w[i]]){
                    profit[j+w[i]]=p[i]+profit[j];
                }
            }
        }
    }
    int maxim=0;
    for(int j=0;j<g;j++){
        if(maxim<profit[j])
        maxim=profit[j];
    }
    out<<maxim;
    return 0;
}