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#define GMAX 1001
#define PMAX 5001
#include <iostream>
#include <fstream>
using namespace std;
ifstream f1("energii.in");
ofstream f2("energii.out");
int G,P;
struct date
{
int e,c;
};
date obiecte[GMAX];
int rucsac[PMAX];
int main()
{
f1>>G>>P;
for(int i=1;i<=G;i++)
{
f1>>obiecte[i].e>>obiecte[i].c;
}
for(int i=1;i<=P;i++)
rucsac[i]=10002;
for(int j=1;j<=G;j++)
{
for(int i=P;i>=obiecte[j].e;i--)
{
int val=rucsac[i-obiecte[j].e]+obiecte[j].c;
if(val<rucsac[i]) rucsac[i]=val;
}
}
f2<<rucsac[P];
return 0;
}