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#include<fstream>
using namespace std;
ifstream f("energii.in");
ofstream g("energii.out");
int V[10002],n,W,i,pmaxi,p,a,b,j;
int main()
{
f>>n>>W;
V[0]=1; pmaxi=0;
for(i=1;i<=n;++i)
{
f>>a>>b;
for(j=pmaxi;j>=0;j--)
if(!V[j+a]) V[j+a]=b;
else V[j+a]=min(V[j+a],b);
pmaxi+=a;
}
p=99999999;
for(i=W;i<=pmaxi;++i) if(V[i]<p) p=V[i];
g<<p<<'\n';
return 0;
}