#include<stdio.h>
struct village
{
 float n;
};
int main(){
 struct village w;
 scanf("%f",&w.n);
 if(w.n<18.5)
 {
     printf("underweight");    
 }
 else if(w.n>=25)
 {
     printf("overweight");
 }
 else
 {
     printf("Normal weight")
 }
 }