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#include <bits/stdc++.h>
using namespace std;
ifstream in("energii.in");
ofstream out("energii.out");
int v[5005],n,c,x,y,ma=85239873;
int main()
{
in >> n >> c;
for(int i=1; i<=c; i++)
{
v[i]=ma;
}
v[0]=0;
for(int i=1; i<=n; i++)
{
in >> x >> y;
for(int j=0; j<c; j++)
{
if(v[j]!=85239873 && j+x<c)
{
if(v[j+x]>v[j]+y)
{
v[j+x]=v[j]+y;
}
}
else if(j+x>=c && v[j]!=85239873)
{
if(y+v[j]<ma)
ma=y+v[j];
}
}
}
out << min(ma,v[c]);
return 0;
}