#include <fstream>
using namespace std;
ifstream in ("rucsac.in");
ofstream out ("rucsac.out");

int n,g,ma[5005][5005],cost[5005],val[5005];

int main()
{
    int i,j;
    in>>n>>g;
    for(i=1;i<=n;i++)
        in>>cost[i]>>val[i];
    for(i=1;i<=n;i++)
        for(j=1;j<=g;j++)
        {
            if(cost[i]<=j)
                ma[i][j]=max(val[i]+ma[i-1][j-cost[i]],ma[i-1][j]);
            else
                ma[i][j]=ma[i-1][j];
        }
    out<<ma[n][g];
    return 0;
}