#include <cstdio>
#include <algorithm>
#define NMAX 5000
#define NMAX1 10000

using namespace std;

struct{
    int g, v;
}ob[NMAX];

int n, gmax, d[NMAX][NMAX1];

void citire()
{
    scanf("%d %d\n", &n, &gmax);
    for(int i=1;i<=n;i++)
        scanf("%d %d\n", &ob[i].g, &ob[i].v);
}

void generare()
{
    for(int i=1;i<=n;i++)
        for(int j=0;j<=gmax;j++)
            if(i<=ob[j].g)
                d[i][j]=d[i-1][j];
            else
                d[i][j]=max(d[i-1][j],d[i-1][j-ob[j].g]+ob[i].v);
    printf("%d ", d[n][gmax]);
}

int main()
{
    freopen("rucsac.in","r",stdin);
    freopen("rucsac.out","w",stdout);

    citire();
    generare();
    return 0;
}