#include <bits/stdc++.h>
#define int long long
const int GMAX = 1e4;
using namespace std;
ifstream fin ("rucsac.in");
ofstream fout ("rucsac.out");
int dp[GMAX + 5], n, G, a, b, ans;
signed main() {
    fin >> n >> G;
    memset(dp,  -1, sizeof(dp));
    dp[0] = 0;
    for (int i = 1; i <= n; i++){
        fin >> a >> b;
        for (int j = G - a; j >= 0; j--){
            if (dp[j] != -1)
                dp[j + a] = max(dp[a + j], dp[j] + b);
        }
    }
    for (int i = 1; i <= G; i++)
        ans = max(ans, dp[i]);
    fout << ans;
    return 0;
}