#include<cstdio>
#include<algorithm>
using namespace std;
int mat[10010][5010];
int main()
{
    int n,g,i,j,w[5010],p[5010];
    freopen("rucsac.in","r",stdin);
    freopen("rucsac.out","w",stdout);
    scanf("%d %d",&n,&g);
    for(i=1;i<=n;i++)
    {
        scanf("%d %d",&w[i],&p[i]);
    }
    for(i=1;i<=g;i++)
    {
        for(j=1;j<=n;j++)
        {
            if(w[j]<=i)
            {
                mat[i][j]=max(mat[i][j-1],mat[i-w[j]][j-1]+p[j]);
            }
            else mat[i][j]=mat[i][j-1];
        }
    }
    printf("%d",mat[g][n]);
    return 0;
}