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#include <cstdio>
#include <algorithm>
using namespace std;
int d[10005];
int main(){
freopen("rucsac.in","r",stdin);
freopen("rucsac.out","w",stdout);
int n,GMAX,i,j,g,p,dr,pmax;
scanf("%d%d",&n,&GMAX);
for(i=1;i<=GMAX;i++){
d[i]=-1;
}
dr=pmax=0;
for(i=1;i<=n;i++){
scanf("%d%d",&g,&p);
for(j=dr;j>=0;j--){
if(j+g<=GMAX){
if(d[j]!=-1){
if(d[j+g]<d[j]+p){
d[j+g]=d[j]+p;
if(j+g>dr){
dr=j+g;
}
}
}
}
}
}
for(i=GMAX;i>=0;i--){
if(pmax<d[i]){
pmax=d[i];
}
}
printf("%d\n",pmax);
return 0;
}