#include <iostream>
#include <cstdio>
using namespace std;
int p[1007],c[1007],d[1007][1007],n,g;
int main(){
    int i,j;
    freopen("energii.in","r",stdin);
    freopen("energii.out","w",stdout);
    scanf("%d%d",&n,&g);
    for(i=1;i<=n;i++)
     scanf("%d%d",&p[i],&c[i]);
     for(i=1;i<=n;i++)
      for(j=1;j<=g;j++)
       {
           d[i][j]=d[i-1][j];
            if(p[i]<=j)
              d[i][j] = max(d[i][j],d[i-1][j-p[i]]+c[i]);
       }
    printf("%d\n",d[n][g]);
    return 0;
}