#include <iostream>
#include <fstream>

using namespace std;

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

#define limN 5002
#define limG 10002

int W[limN], P[limN];
int dp[2][limG];

int main()
{
    int n, gmax;
    fin>>n>>gmax;
    
    for(int i = 1; i <= n; i++) {
        fin>>W[i]>>P[i];
    }
    
    for(int i = 1; i <= n; i++) {
        for(int j = 0; j <= gmax; j++) {
            dp[i%2][j] = dp[(i-1)%2][j];
            if(W[i] <= j)
                dp[i%2][j] = max(dp[i%2][j], dp[(i-1)%2][j-W[i]]+P[i]);
        }
    }

    fout<<dp[n%2][gmax];

    return 0;
}