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#include <bits/stdc++.h>
using namespace std;
struct Ir{
int c,v;
};
Ir v[5005];
int cmp(Ir a,Ir b)
{
if(a.c==b.c)
return a.v > b.v;
return a.c>b.c;
}
int dp[10005];
int main()
{
ifstream cin("rucsac.in");
ofstream cout("rucsac.out");
int n,m;
cin>>n>>m;
for(int i=1;i<=n;i++)
{
cin>>v[i].c>>v[i].v;
}
sort(v+1,v+n+1,cmp);
for(int i=1;i<=n;i++)
{
for(int j=m;j>=0;j--)
{
if(dp[j]>0 && v[i].c+j<=m)
dp[v[i].c+j]=max(dp[v[i].c+j],dp[j]+v[i].v);
}
dp[v[i].c]=max(dp[v[i].c],v[i].v);
}
for(int i=1;i<=m;i++)
{
dp[i]=max(dp[i-1],dp[i]);
}
cout<<dp[m];
return 0;
}