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#include <fstream>
using namespace std;
ifstream in("energii.in");
ofstream out("energii.out");
int n,k,e,c,dp[10001];
int se,sc;
int main()
{ in>>n>>k;
for(int i=1;i<=k;i++)
dp[i]=2000000000;
for(int i=1;i<=n;i++)
{ in>>e>>c;
for(int j=k;j>0;j--)
{ if(j<e)
dp[j]=dp[j];
else
dp[j]=min(dp[j],dp[j-e]+c);
}
}
out<<dp[k];
in.close();
out.close();
return 0;
}