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#include <bits/stdc++.h>
using namespace std;
ifstream fin("energii.in");
ofstream fout("energii.out");
const int WMAX=5005;
const int INF = 1e9;
int dp[WMAX + 1];//solutie de cost minim pt energie j
int main()
{
fill(dp + 1, dp + WMAX + 1, INF);//daca nu am solutie ii pun inf
int n,wmax;
fin>>n>>wmax;
dp[0]=0;
for(int i=1; i<=n; i++)
{
int en,ct;
fin>>en>>ct;
for(int j=WMAX;j>=en;j--){
if(j>=en){
dp[j]=min(dp[j],dp[j-en]+ct);
}
}
}
int ans=INF;
for(int i=wmax;i<=WMAX;i++){
ans=min(ans,dp[i]);
}
fout<<ans;
}