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#include <fstream>
using namespace std;
ifstream f("energii.in");
ofstream g("energii.out");
int INF=(1<<30),G,w,d[1002][5002],o,l;
int main()
{
f>>n>>G;
for (i=0;i<=n;i++)
for (j=1;j<=G;j++)
d[i][j]=INF;
for (i=1;i<=n;i++)
{
f>>o>>l;
for(j=1;j<=G;j++)
if (o>j) d[i][j]=min(d[i-1][j],l);
else d[i][j]=min(d[i-1][j],d[i-1][j-o]+l);
}
if (d[n][G]==INF) g<<'-1'<<'\n';
else g<<d[n][G]<<'\n';
return 0;
}