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#include <iostream>
#include <bits/stdc++.h>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int n,gre,profit,gr,v1[5005],v2[5005];
int main()
{
f >> n >> gre;
for (int i=1;i<=n;i++) {
f >> gr >> profit;
for (int j=1;j<=gre;j++) {
if (gr>j) {
v2[j]=v1[j];
}
else {
v2[j]=max(v1[j] ,v1[j-gr]+profit);
}
}
for (int k=1;k<=gre;k++) {
v1[k]=v2[k];
v2[k]=0;
}
}
g << v1[gre];
return 0;
}