#include <cstdio>
#define nmax 5005

using namespace std;

int w[nmax],p[nmax],g,n,a[3][nmax],k;

void citire()
{
    scanf("%d%d",&n,&g);
    for(int i=1;i<=n;i++)
        scanf("%d%d",&w[i],&p[i]);
}

int maxim(int a,int b)
{
    if(a>b)
        return a;
    return b;
}

void rezolv()
{
    k=1;
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=g;j++)
        {
            if(w[i]<=j)
                a[k][j]=maxim(a[!k][j],a[!k][j-w[i]]+p[i]);
            else
                a[k][j]=a[!k][j];
        }
        k=!k;
    }
    k=!k;
}

int main()
{
    freopen("rucsac.in","r",stdin);
    freopen("rucsac.out","w",stdout);
    citire();
    rezolv();
    printf("%d\n",a[k][g]);
    return 0;
}