#include <bits/stdc++.h>
#define MAX 5100
#define MAX2 10100
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int c[MAX],g[MAX],n,G;
int cmax[MAX2];
int main()
{
    int i,x;
    fin>>n>>G;
    for(i=1;i<=n;i++)
        fin>>g[i]>>c[i];
    for(i=1;i<=n;i++)
        for(x=G;x>=g[i];x--)
        if(cmax[x]<c[i]+cmax[x-g[i]])
        cmax[x]=c[i]+cmax[x-g[i]];
    fout<<cmax[G];
    return 0;
}