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

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

int weight[5000],profit[5000];
int n,max_weight;


int dp[10001][5001];

void read()
{
    in>>n>>max_weight;
    for(int i=0; i<n; i++)
    {
        in>>weight[i]>>profit[i];
    }
}

int knapsack()
{
    for(int i=1; i<=n; i++)
    {
        for(int g=0; g<=max_weight; g++)
        {
            dp[i][g]=dp[i-1][g];
            if(weight[i-1]<=g)
            {
                dp[i][g]=max(dp[i][g],dp[i-1][g-weight[i-1]]+profit[i-1]);
            }
        }
    }

    return dp[n][max_weight];
}

int main()
{
    read();
    out<<knapsack();

}