#include <fstream>
using namespace std;
ifstream cin("rucsac.in");
ofstream cout("rucsac.out");
#define MAXN 5010
int n,g,i,j;
int greutate[MAXN],profit[MAXN],dp[10005];
int main()
{
    cin>>n>>g;
    for(i=1; i<=n; i++)
        cin>>greutate[i]>>profit[i];
    for(i=1; i<=n; i++)
    {
        for(j=greutate[i]; j<=g; j++)
        {
            if(dp[j-greutate[i]] < dp[j] + profit[i])
                dp[j-greutate[i]]= dp[j]+profit[i];
        }
    }
    cout<<dp[0];

}