#include <fstream>
#include <algorithm>
#define nmax 5001
#define cmax 10001
using namespace std;
ifstream cin("rucsac.in");
ofstream cout("rucsac.out");

int dp[nmax][cmax], g[nmax], c[nmax], n, m;

int main()
{
    cin>>n>>m;
    for(int i=1; i<=n; i++)
        cin>>g[i]>>c[i];

    /// dinamica rucsac

    for(int i=1; i<=n; i++)
    {
        for(int j=0; j<=cmax; j++)
        {
            if(j<g[i])
                dp[i][j]=dp[i-1][j];
            else
                dp[i][j] = max(dp[i-1][j], dp[i-1][j-g[i]]+c[i]);
        }
    }
    cout<<dp[n][m];
}