#include <iostream>
#include <fstream>
using namespace std;
#define MAXN 5010
#define MAXG 10010
ifstream f("rucsac.in");
ofstream g("rucsac.out");
long long  n,a[2][MAXG],val[MAXN],w[MAXN],gr,maxim,nr,nr1,i,j;
int main()
{
    f>>n>>gr;
    for(i=1;i<=n;i++)
    {
        f>>w[i]>>val[i];
        for(j=0;j<=gr;j++)
        {
            a[i%2][j]=a[(i-1)%2][j];
            if(j>=w[i])
            if(a[i%2][j]<a[(i-1)%2][j-w[i]]+val[i])
            {
                a[i%2][j]=a[(i-1)%2][j-w[i]]+val[i];
            }
        }
    }
    g<<a[n%2][gr];
    return 0;
}