#include <cstdio>
using namespace std;
#define MAXN 5010
#define MAXG 10010
FILE *f=fopen("rucsac.in","r");
FILE *g=fopen("rucsac.out","w");
long long  n,a[2][MAXG],val[MAXN],w[MAXN],gr,maxim,nr,nr1,i,j;
int main()
{
    fscanf(f,"%d%d",&n,&gr);
    for(i=1;i<=n;++i)
    {
        fscanf(f,"%d%d",&w[i],&val[i]);
        for(j=0;j<=gr;++j)
        {
            a[i%2][j]=a[(i-1)%2][j];
            if(j>=w[i])
            if(a[i%2][j]<a[(i-1)%2][j-w[i]]+val[i])
            {
                a[i%2][j]=a[(i-1)%2][j-w[i]]+val[i];
            }
        }
    }
    fprintf(g,"%d",a[n%2][gr]);
    return 0;
}