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#include <iostream>
#include <fstream>
#define N 1011
using namespace std;
ifstream f("energii.in");
ofstream g("energii.out");
int a[N][N],w[N],v[N],i,j,x,y,n,m,k,t,p,gmax,r;
int main()
{
f>>n>>gmax;
for(i=1;i<=n;i++)
{
f>>v[i]>>w[i];
}
int l=0;
for(i=1;i<=n;i++,l=1-l)
{
for(j=0;j<=gmax;j++)
{
a[1-l][j]=a[l][j];
if(v[i]<=j)
{
a[1-l][j]=max(a[1-l][j],a[l][j-v[i]]+w[i]);
}
}
}
g<<a[l][gmax];
}