#include<stdio.h>
struct BMI
{
    float a;
};
int main()
{
    struct will BMI
    scanf("%f",&BMI.a);
    if(BMI<=18.5)
    {
        printf("Underweight");
    }
    else
    if(BMI.a>18.5&&24.5);
    {
        printf("Normal weight");
    }
    else
    {
        printf("Overweight");
    }
}