#include<stdio.h>
struct BMI
{
    float weight;
};
int main()
{
    struct BMI no;
    scanf("%.1f\n",&no.weight);
    if(no.weight<18.5)
    {
        printf("Underweight");
    }
    else if(no.weight>=18.5 || no.weight<25)
    {
        printf("Normal weight");
    }
    else
    {
        printf("Overweight");
    }
    return 0;
}