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#include <cstdio>
using namespace std;
int g[5002],p[5002],best[10002];
int main()
{
int n,s,i,j;
freopen("rucsac.in","r",stdin);
freopen("rucsac.out","w",stdout);
scanf("%d%d",&n,&s);
for(i=1; i<=n; i++)
scanf("%d%d",&g[i],&p[i]);
int max=0;
for(i=1; i<=n; i++)
{
for(j=max; j>=1; j--)
if(best[j]!=0&&j+g[i]<=s&&best[j]+p[i]>best[j+g[i]])
{
best[j+g[i]]=best[j]+p[i];
if(j+g[i]>max)max=j+g[i];
}
if(g[i]<=s&&best[g[i]]<p[i])
{
best[g[i]]=p[i];
if(g[i]>max)max=g[i];
}
}
max=0;
for(i=0; i<=s; i++)
if(best[i]>max)max=best[i];
printf("%d\n",max);
return 0;
}