#include <bits/stdc++.h>

#define NMax 5001
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");

int n,G;
int w[2 * NMax],p[2 * NMax],dp[2 * NMax];

int main()
{
    f >> n >> G;
    for(int i = 1; i <= n; ++i){
        f >> w[i] >> p[i];
    }
    for(int i = 1; i <= n; ++i){
        for(int j = G; j >= w[i]; --j){
            dp[j] = max(dp[j],dp[j - w[i]] + p[i]);
        }
    }
    g << dp[G] << '\n';
    return 0;
}