#include <bits/stdc++.h>
using namespace std;

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

int n, g, pmax, w[5005], p[5005], dp[10005];

int main(){
    in>>n>>g;
    for(int i = 1; i <= n; i++)
        in>>w[i]>>p[i];
    for(int i = 1; i <= n; i++){
        for(int j = g - w[i]; j >= 0; j--)
        if(dp[j + w[i]] < dp[j] + p[i]){
            dp[j + w[i]] = dp[j] + p[i];
            pmax = max(pmax , dp[j + w[i]]);
        }
    }
    out<<pmax;
}