#include<stdio.h>
struct villager {
    float bmi;
};
  int main()
{
    struct villager v;
    scanf("%f",&v.bmi);
    if(v.bmi<18.5)
    {
        printf("Underweight");
    }else if(v.bmi<=18.5&24.9)
    {
        printf("Normal weight");
    }
    else 
    {
        printf("Overweight");
    }
}