#include <iostream>
#include <fstream>
#include <cstring>
#include <stack>

using namespace std;
ifstream in("rucsac.in");
ofstream out("rucsac.out");

#define ll long long
const ll GMax = 1e4 + 5;

int N,G;
ll dp[GMax];

int main() {

    in>>N>>G;
    for (int i=1;i<=N;++i) {
        int weight,value;
        in>>weight>>value;
        for (int j=G;j - weight >= 0;--j) {
            dp[j] = max(dp[j],dp[j - weight] + value);
        }
    }

    out<<dp[G]<<'\n';

    in.close();out.close();
    return 0;
}