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