#include<iostream>
#include<map>
#include<algorithm>
using namespace std;
main(){
while(1){
int n,a,b,c;
cin>>n;
if(n==0) break;
map<long,int> m;
for(;n>0;n--){
cin>>a>>b>>c;
m.insert((long)b*c,a);
}
m.sort();
cout<<(m.begin()).first<<endl;
}
}
cout<<"NA"<<endl;
}