#include<stdio.h>
struct well
{
    float a;
};
int main()
{
    struct well BMI;
    scanf("%1.f",&BMI.a);
    if(BMI.a<18.5)
    {
        printf("Underweight");
    }
    else if(BMI.a>18.5||24.9)
    {
        printf("Normal weight");
    }
    else
    {
        printf("Overweight");
    }
}