#include<stdio.h>

struct villager{
   float BMI; 
};
int main()
{
    struct villager v;
    
    scanf("%f",&v.BMI);
    
    if(BMI<0.0 ||BMI>100.0)
    {
        printf("Invalid Input");
    }
    else if(BMI<18.5)
    {
        printf("Underweight");
    }
     else if(BMI>18.5 && BMI<=24.9)
    {
        printf("Normal weight");
    }
     else if(BMI>=25)
    {
        printf("Overweight");
    }
    return 0;
}