#include<stdio.h>
struct weighi
{
    float n;
};
int main()
{
    struct weight BMI;
    scanf("%f",&weight);
    if(weighi<=18.5)
    {
        printf("Underweight");
    }
    else(weight>18.5||weight<=24.9)
    {
        printf("Normal weight");
    }
    else(weight>=25)
    {
        printf("Overweight");
    }
    return 0;
}