#include <fstream>
#include <cstring>
#include <cstdlib>

using namespace std;

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

int g[1001], p[1001], n, cap;
int dp[3][10001]; // d[N][cap]


int main() {
    

    cin >> n >> cap;
    for(int i = 1; i <= n; ++i) {
        cin >> g[i] >> p[i];
    }

    for(int i = 1, l = 1; i <= n; ++i, l = 3 - l) {
        for(int j = 1; j <= cap; ++j) {
            dp[l][j] = dp[3 - l][j];
            if(j >= g[i])
                dp[l][j] = max(dp[3 - l][j], dp[3 - l][j - g[i]] + p[i]);
        }
    }

    cout << dp[n][cap];
}