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#include <iostream>
#include <fstream>
#define INF 1000000000
using namespace std;
ifstream fin("energii.in");
ofstream fout("energii.out");
int n,w,v[5005];
int main()
{
fin>>n>>w;
for(int i=1;i<=w;i++)
v[i]=INF;
for(int i=1;i<=n;i++) {
int x,y;
fin>>x>>y;
for(int j=w;j>=0;j--) {
int next=j+x;
if(next>w)
next=w;
v[next]=min(v[j]+y,v[next]);
}
}
fout<<v[w];
return 0;
}