#include<stdio.h>
struct BMIInfo
{
    float bmi;
};
int main()
{
    struct BMIInfo person;
    scanf("%f",&person.bmi);
    if(person,bmi<18.5)
    {
        printf("Underweight");
    }
    else if(person.bmi>=18.5&&person.bmi<=24.9)
    {
        printf("Normal weight");
    }
    else
    {
        printf("Overweight");
    }
    return 0;
}