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#include <iostream>
#include <fstream>
using namespace std;
int i,G,w,e[1001],c[1001],mi=5001,q=0,j,s,cs,a,b;
int main()
{
ifstream f("energii.in");
ofstream g("energii.out");
f>>G;
f>>w;
for(i=1;i<=G;i++)
{
f>>a;
f>>b;
if(a>=w)
{
if(b<mi)
mi=b;
}
else
{
q++;
e[q]=a;
c[q]=b;
e[q]=e[q]+e[q-1];
c[q]=c[q]+c[q-1];
}
}
for(i=1;i<q;i++)
{
for(j=i+1;j<=q;j++)
{
s=e[j]-e[i-1];
cs=c[j]-c[i-1];
if(s>=w and cs<mi)
mi=cs;
}
}
g<<mi;
return 0;
}