#include <iostream>
#include <fstream>
using namespace std;
ifstream in("rucsac.in");
ofstream out("rucsac.out");
int dp[1000][1000], w[1000], p[1000], n, g;




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 cw=0;cw<=g;cw++){
            dp[i][cw]=dp[i-1][cw];
            if(w[i]<=cw){
                dp[i][cw]=max(dp[i][cw], dp[i-1][cw-w[i]]+p[i]);
            }

        }
    }
    out<<dp[n][g];
}