#include<cstdio>
using namespace std;
int v[10002];
int main ()
{
    int n,g,i,x,y,j,maxim=0;
    freopen("rucsac.in","r",stdin);
    freopen("rucsac.out","w",stdout);
    scanf("%d%d",&n,&g);
    for(i=1;i<=n;i++)
    {
        scanf("%d%d",&x,&y);
        for(j=g;j>=1;j--)
            if(v[j]!=0)
                if(j+x<=g&&v[j]+y>v[j+x])
                    v[j+x]=v[j]+y;
        if(y>v[x])
            v[x]=y;
    }
    for(i=1;i<=g;i++)
        if(v[i]>maxim)
            maxim=v[i];
    printf("%d",maxim);
    return 0;
}