#include <iostream>
#include <fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int n,G;
int main()
{
    f>>n>>G;
    int wt[n],val[n],a[n][G];
    for(int i=1;i<=n;i++)
        f>>wt[i]>>val[i];
    for(int i=1;i<=n;i++)
        for(int j=1;j<=G;j++)
    {
        if(wt[i]>j) a[i][j]=a[i-1][j];
        else a[i][j]=max(val[i]+a[i-1][j-wt[i]],a[i-1][j]);
    }
    g<<a[n][G];
    return 0;
}