#include<cstdio>
int n,i,w,W,V,v[10010];
int main()
{
    freopen("rucsac.in","r",stdin);
    freopen("rucsac.out","w",stdout);
    scanf("%d%d",&n,&w);
    for(i=1;i<=w;i++)v[i]=1<<31;
    for(;n;n--)
    {
        scanf("%d%d",&W,&V);
        for(i=w-W;i>=0;i--)
            if(v[i]>=0)
                v[i+W]=v[i+w]>v[i]+V?v[i+W]:v[i]+V;
    }
    for(i=1,V=0;i<=w;i++)V=V>v[i]?V:v[i];
    printf("%d\n",V);
    return 0;
}