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#include <iostream>
#include <math.h>
#include <vector>
#include <queue>
#include <stack>
#include <list>
#include <iomanip>
#include <stdlib.h>
#include <fstream>
#include <algorithm>
#include <string>
#include <set>
using namespace std;
ifstream f("energii.in");
ofstream g("energii.out");
int n , gmax , dp[1002] , gc , vc , mmax;
int main() {
f>>n>>gmax;
for(int i=1;i<=n;i++)
{
f>>gc>>vc;
mmax+=gc;
for(int j= gmax ; j>=gc ; j--)
{dp[j] = max(dp[j] , dp[j-gc] + vc);
}
}
if(mmax >= gmax)
g<<dp[gmax];
else g<<-1;
return 0;
}