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#include <iostream>
#include <fstream>
using namespace std;
int i,G,w,e[1001],c[1001],mi=9999,k=1,q,l,j,ok,a[1001],b[1001],v[1001],z[1001],u,s,cs;
int main()
{
ifstream f("energii.in");
ofstream g("energii.out");
f>>G;
f>>w;
for(i=1;i<=G;i++)
{
f>>e[i];
f>>c[i];
if(e[i]>=w)
{
if(c[i]<mi)
mi=c[i];
}
else
{
q++;
v[q]=e[i];
z[q]=c[i];
}
}
while(k<q)
{
for(i=1;i<=q;i++)
{
for(j=i+1;j<=q;j=j++)
{
ok=k+j;
s=v[i];
cs=z[i];
for(l=j;l<=ok;l++)
{
s=s+v[l];
cs=cs+z[l];
}
if(s>=w)
{
u++;
a[u]=s;
b[u]=cs;
}
}
}
k++;
}
for(i=1;i<=u;i++)
if(b[i]<mi)
mi=b[i];
g<<mi;
return 0;
}