#include <iostream>
#include <fstream>
#define Nmax 5001
#define Gmax 100001
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int N,G,i,j,sol;
short int W[Nmax],P[Nmax],DP[Nmax][Gmax];

void read()
{
     fin>>N>>G;
    for(int i=1;i<=N;++i)
        fin>>W[i]>>P[i];
}

void solve()
{cout<<5;
    int i,j;

    for(i=1;i<=N;i++)
    {
        for(j=0;j<=G;j++)
              DP[i][j]=max(DP[i-1][j],DP[i-1][j-W[i]]+P[i]);

        }

    fout<<DP[N][G];
    }


int main()
{

    read();
    solve();
    return 0;
}