#include<stdio.h>
int g[5005],p[5005],optim[10001];
int main()
{
    freopen("rucsac.in","r",stdin);
    freopen("rucsac.out","w",stdout);
    int n,G,i,j,sol=0;
    scanf("%d%d",&n,&G);
    for(i=1;i<=n;i++)
        scanf("%d%d",&g[i],&p[i]);
    for(i=1;i<=n;i++)
    {
        for(j=G-g[i];j>=0;j--)
            if(optim[j+g[i]]<optim[j]+p[i])
            {
                optim[j+g[i]]=optim[j]+p[i];
                if(sol<optim[j+g[i]])
                    sol=optim[j+g[i]];
            }
    }
    printf("%d",sol);
}