#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int dp[2][10005];
int main(){
    int answer = 0;
    int n, g;
    fin >> n >> g;
    for (int i = 1; i <= n; i++){
        for (int j = 0; j <= g; j++){
            dp[(i % 2)][j] = 0;
        }
        int greutate, cost;
        fin >> greutate >> cost;
        for (int j = 0; j <= g; j++){
            if (greutate > j){
                dp[i % 2][j] = dp[(i - 1) % 2][j];
                answer = max(answer, dp[i % 2][j]);
                continue;
            }
            dp[i % 2][j] = max(dp[(i-1) % 2][j - greutate] + cost, dp[(i - 1) % 2][j]);
            answer = max(answer, dp[i % 2][j]);
        }
    }
    fout << answer;
    return 0;
}