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#include <bits/stdc++.h>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
const int minf=-2000000000;
int n,gmax,gr,pr,st,dr;
int main()
{
f>>n>>gmax;
vector<int> p(gmax+1,minf);
p[0]=0;
for(;n;n--)
{
f>>gr>>pr;
for(st=gmax-gr,dr=gmax;st>=0;st--,dr--)
p[dr]=max(p[dr],p[st]+pr);
}
g<<*max_element(p.begin(),p.end());
return 0;
}