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#include<bits/stdc++.h>
#define N 5050
using namespace std;
int e[1020], g, dp[N], c[1020], i, w, j;
int main(){
ifstream fin("energii.in");
ofstream fout("energii.out");
fin>>g>>w;
for(i=1;i<=g;i++) fin>>e[i]>>c[i];
for(i=0;i<=w;i++) dp[i]=5001;
for(i=1;i<=g;i++)
for(j=w; j>=1;j--){
if(j>=e[i] && dp[j-e[i]]+c[i]<dp[j]) dp[j]=dp[j-e[i]]+c[i];
}
fout<<dp[w];
return 0;
}