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#include <iostream>
#include <fstream>
using namespace std;
int i,G,w,e[1001],c[1001],mi=9999,q=0,j,a[9999],b[9999],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++;
e[i]=e[i]+e[i-1];
c[i]=c[i]+c[i-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)
{
u++;
a[u]=s;
b[u]=cs;
}
}
}
for(i=1;i<=u;i++)
if(b[i]<mi)
mi=b[i];
g<<mi;
return 0;
}