import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {
	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String[] sa = br.readLine().split(" ");
		int n = Integer.parseInt(sa[0]);
		int m = Integer.parseInt(sa[1]);
		int[] s = new int[n];
		int[] a = new int[n];
		for (int i = 0; i < n; i++) {
			sa = br.readLine().split(" ");
			s[i] = Integer.parseInt(sa[0]);
			a[i] = Integer.parseInt(sa[1]);
		}
		br.close();

		int[] dp = new int[m + 1];
		for (int i = 0; i < n; i++) {
			for (int j = m - s[i]; j >= 0; j--) {
				int nj = j + s[i];
				dp[nj] = Math.max(dp[nj], dp[j] + a[i]);
			}
		}
		System.out.println(dp[m]);
	}
}