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#include <fstream>
using namespace std;
int v[15001],i,j,e,g,n,w,c;
int main()
{
ifstream f("energii.in");
ofstream h("energii.out");
int min=1000000000;
for(i=1;i<=15000;i++)v[i]=1000000000;
v[0]=0;
f>>n>>w;
for(i=1;i<=n;i++){
f>>e>>c;
for(j=w-1;j>=0;j--){
if(v[j]!=1000000000&&v[j]+c<v[j+e])v[j+e]=v[j]+c;
}
}
for(i=w;i<15001;i++){
if(v[i]!=1000000000)if(v[i]<min)min=v[i];
}
if(min!=1000000000) h<<min;
else h<<-1;
return 0;