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#include<fstream>
using namespace std;
ifstream f("energii.in");
ofstream g("energii.out");
int n, gmax, w[1001], p[1001], v1[5001], v2[5001], i, j, pmax;
int main()
{
f>>n>>gmax;
for(i=1;i<=n;i++)f>>w[i]>>p[i];
for(i=1;i<=n;i++)
{
for(j=1;j<=gmax;j++)
{
v1[j]=v2[j];
if(j>=w[i])
{
v1[j]=max(v2[j],p[i]+v2[j-w[i]]);
}
if(v1[j]>=gmax)
{
g<<v1[j];
break;
}
}
for(j=1;j<=gmax;j++)v2[j]=v1[j];
//pmax=v1[gmax];
}
//g<<pmax;
f.close();
g.close();
return 0;
}