#include <iostream>
#include <fstream>
using namespace std;
#define MAX 10001
int v[MAX], n, g;
int main()
{
    int i, p, w, j;
    ifstream fin("rucsac.in");
    ofstream fout("rucsac.out");
    fin>>n>>g;
    for(i=1; i<=n; i++){
        fin>>w>>p;
        for(j=g; j>=w; j--)
            if(v[j]<v[j-w]+p)
                v[j] = v[j-w] + p;
    }
    fout<<v[g];
    return 0;
}