#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int N,G,w[50005],p[10005],dp[2][10005];
int main()
{
    fin>>N>>G;
    for(int i=1; i<=N; i++)
        fin>>w[i]>>p[i];

    for(int i=1; i<=N; i++)
        for(int j=1; j<=G; j++)
        {
            if(j>=w[i])
                dp[i%2][j]=max(dp[(i-1)%2][j],dp[(i-1)%2][j-w[i]]+p[i]);
            else
                dp[i%2][j]=dp[(i-1)%2][j];
        }
    fout<<dp[N%2][G];
    return 0;
}