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#include <fstream>
using namespace std;
int i,j,n,G,sol;
int v[5005],w[5005],m[10005];
int main()
{
ifstream f("energii.in");
ofstream g("energii.out");
f>>n>>G;
for(i=1;i<=n;i=i+1)
{
f>>w[i];
f>>v[i];
}
for(i=0;i<=G;i=i+1)
m[i]=20000;
for(i=1;i<=n;i++)
for(j=G;j>=0;j--)
if(w[i]<j)
m[j]=min(m[j],m[j-w[i]]+v[i]);
else
m[j]=min(m[j],v[i]);
if(m[G]!=20000)
g<<m[G];
else
g<<-1;
return 0;
}