#include <bits/stdc++.h>

using namespace std;

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

const int DIM = 5000 + 5;

int w[DIM], p[DIM], dp[2][DIM * 2];

int main()
{
    int n, m;

    fin >> n >> m;
    for(int i = 1; i <= n; ++i) {
        fin >> w[i] >> p[i];
    }
    int phase = 1;
    for(int i = 1; i <= n; ++i, phase ^= 1) {
        for(int j = 1; j <= 10000; ++j) {
            dp[phase ^ 1][j] = dp[phase][j];
            if(j >= w[i]) {
                dp[phase ^ 1][j] = max(dp[phase ^ 1][j], dp[phase][j - w[i]] + p[i]);
            }
        }
    }
    fout << dp[phase][m];
    return 0;
}