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#include <iostream>
#include <math.h>
#include <vector>
#include <queue>
#include <stack>
#include <list>
#include <iomanip>
#include <stdlib.h>
#include <fstream>
#include <algorithm>
#include <string>
#include <set>
#define INF 1e9
using namespace std;
ifstream f("energii.in");
ofstream g("energii.out");
int n , gmax , gc , vc;
int dp[10020];
int main() {
f>>n>>gmax;
for(int i=1;i<=gmax;i++)dp[i]=INF;
for(int i=1;i<=n;i++)
{
f>>gc>>vc;
for(int j= gmax ; j>=gc ; j--)
dp[j] = min(dp[j] , dp[j-gc] + vc);
}
if(dp[gmax] != INF)g<<dp[gmax];
else g<<-1;
return 0;
}