#include <fstream>

using namespace std;

ifstream in("rucsac.in");
ofstream out("rucsac.out");

int w[5001], p[5001];
int optim[10001];
int n, g;

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