#include <fstream>
using namespace std;

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

int main() {
    int w[5005], p[5005];
    int dp[10005] = {0};
    int n, gmax;
    fin >> n >> gmax;
    for (int i = 1; i <= n; ++i) {
        fin >> w[i] >> p[i];
    }

    for (int i = 1; i <= n; ++i) {
        for (int j = gmax; j >= w[i]; --j) {
            if (dp[j - w[i]] + p[i] > dp[j]) {
                dp[j] = dp[j - w[i]] + p[i];
            }
        }
    }

    fout << dp[gmax];
    return 0;
}