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#include <cstdio>
using namespace std;
int v[10010],n,k,x,lim,i,j,a,c,max;
int main()
{
freopen("rucsac.in", "r", stdin);
freopen("rucsac.out", "w", stdout);
scanf("%d%d",&n,&k);
x=0;
for(i=1;i<=n;i++)
{
scanf("%d%d",&a,&c);
if(x<k-a) lim=x;
else lim=k-a;
for(j=lim;j>=0;j--)
if((v[j] || j==0) && v[j+a]<v[j]+c)
{
v[j+a]=v[j]+c;
if(max<v[j+a]) max=v[j+a];
if(x<j+a) x=j+a;
}
}
printf("%d",max);
return 0;
}