#include<stdio.h>
#include<algorithm>
using namespace std;
int mat[2][5005];
int main()
{
    int n,g,greutate[5005],profit[5005],i,j,linie=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",&greutate[i],&profit[i]);

    for(i=1;i<=n;++i,linie=1-linie)
        for(j=0;j<=g;++j){
            mat[linie][j]=mat[1-linie][j];
            if(greutate[i]<=j)
                mat[linie][j]=max(mat[linie][j],mat[1-linie][j-greutate[i]]+profit[i]);
        }

    printf("%d",mat[1-linie][g]);
    fclose(stdin);fclose(stdout);
    return 0;
}