#include<cstdio>
#include<algorithm>
using namespace std;
FILE *f=fopen("rucsac.in","r");
FILE *g=fopen("rucsac.out","w");
int n, gmax, w[5001], p[5001], a[5001][10001], i, j;
int main()
{
    fscanf(f,"%d %d",&n,&gmax);
    for(i=1;i<=n;i++)fscanf(f,"%d %d",&w[i],&p[i]);
    for(i=1;i<=n;i++)
    {
        for(j=1;j<=gmax;j++)
        {
            a[i][j]=a[i-1][j];
            if(j>=w[i])
            {
                a[i][j]=max(a[i-1][j],p[i]+a[i-1][j-w[i]]);
            }
        }
    }
    fprintf(g,"%d",a[n][gmax]);
    fclose(f);
    fclose(g);
    return 0;
}