#include<cstdio>
using namespace std;
int n ,G,/*p[10001][10001]*/c[10001][10001];
struct{ int gr, cost;}v[10001];
void citire(){
    freopen("rucsac.in","rt",stdin);
    scanf("%d%d",&n,&G);
    for(int i=1;i<=n ;++i){
        scanf("%d%d",&v[i].gr,&v[i].cost);
    }
}
void pd(){
    for(int i=1;i<=n;++i)
        for(int j=1;j<=G;++j)
            if(v[i].gr<=j&&v[i].cost+c[i-1][j-v[i].gr]>c[i-1][j]){
                c[i][j]=v[i].cost+c[i-1][j-v[i].gr];
                //p[i][j]=i;
            }
            else{
                c[i][j]=c[i-1][j];
                //p[i][j]=p[i-1][j];
            }
}
void afisare(){
    int i=n,j=G,k;
    freopen("rucsac.out","wt",stdout);
    printf("%d\n",c[n][G]);
   /* while(p[i][j]){
        k=p[i][j];
        //printf("ob%d gr%d cost%d \n",k,v[k].gr,v[k].cost);
        j-=v[p[i][j]].gr;
        while(p[i][j]==k)--i;
    }*/
}
int main(){
    citire();
    pd();
    afisare();
    return 0;
}