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#include <stdio.h>
#include <iostream>
#define NMAX 15000
using namespace std;
int dp[NMAX+5];
int main()
{
freopen("energii.in","r",stdin);
freopen("energii.out","w",stdout);
int n,w; scanf("%d%d", &n, &w);
int i,j,maxi=0;
int energie,cost;
for(i=1;i<=n;i++)
{
scanf("%d%d", &energie, &cost);
for(j=maxi;j>=0;j--)
if(dp[j]!=0 && j+energie<=w)
dp[j+energie]=max(dp[j+energie],dp[j]+cost);
dp[energie]=max(dp[energie],cost);
if(maxi+energie>w)
maxi=w;
else
maxi=maxi+energie;
}
int valid=0;
for(i=0;i<=maxi&&valid==0;i++)
if(dp[i]>=w)
{
valid=1;
printf("%d ", dp[i]);
}
if(valid==0)
printf("-1");
}